Citrix Hypervisor

Virtual GPU Software R460 for Citrix Hypervisor Release Notes

Release information for all users of NVIDIA virtual GPU software and hardware on Citrix Hypervisor.

These Release Notes summarize current status, information on validated platforms, and known issues with NVIDIA vGPU software and associated hardware on Citrix Hypervisor.

1.1. NVIDIA vGPU Software Driver Versions

Each release in this release family of NVIDIA vGPU software includes a specific version of the NVIDIA Virtual GPU Manager, NVIDIA Windows driver, and NVIDIA Linux driver.

For details of which Citrix Hypervisor releases are supported, see Hypervisor Software Releases.

1.2. Compatibility Requirements for the NVIDIA vGPU Manager and Guest VM Driver

The releases of the NVIDIA vGPU Manager and guest VM drivers that you install must be compatible. If you install an incompatible guest VM driver release for the release of the vGPU Manager that you are using, the NVIDIA vGPU fails to load.
See VM running an incompatible NVIDIA vGPU guest driver fails to initialize vGPU when booted.

Compatible NVIDIA vGPU Manager and Guest VM Driver Releases

The following combinations of NVIDIA vGPU Manager and guest VM driver releases are compatible with each other.

• NVIDIA vGPU Manager with guest VM drivers from the same release
• NVIDIA vGPU Manager with guest VM drivers from different releases within the same major release branch
• NVIDIA vGPU Manager from a later major release branch with guest VM drivers from the previous branch

The following table lists the specific software releases that are compatible with the components in the NVIDIA vGPU software 12 major release branch.

Incompatible NVIDIA vGPU Manager and Guest VM Driver Releases

The following combinations of NVIDIA vGPU Manager and guest VM driver releases are incompatible with each other.

• NVIDIA vGPU Manager from a later major release branch with guest VM drivers from two or more major releases before the release of the vGPU Manager
• NVIDIA vGPU Manager from an earlier major release branch with guest VM drivers from a later branch

The following table lists the specific software releases that are incompatible with the components in the NVIDIA vGPU software 12 major release branch.

1.3. Updates in Release 12.4

New Features in Release 12.4

• Security updates - see Security Bulletin: NVIDIA GPU Display Driver - October 2021, which is posted shortly after the release date of this software and is listed on the NVIDIA Product Security page
• Miscellaneous bug fixes

Hardware and Software Support Introduced in Release 12.4

• Support for Citrix Virtual Apps and Desktops version 7 2109

1.4. Updates in Release 12.3

New Features in Release 12.3

• Security updates - see Security Bulletin: NVIDIA GPU Display Driver - July 2021
• Miscellaneous bug fixes

Hardware and Software Support Introduced in Release 12.3

• Support for Citrix Virtual Apps and Desktops version 7 2106

Feature Support Withdrawn in Release 12.3

• Citrix Hypervisor 7.0 is no longer supported.
• Red Hat Enterprise Linux 8.3 is no longer supported as a guest OS.

1.5. Updates in Release 12.2

New Features in Release 12.2

• Support for unified memory with NVIDIA vGPU
• Security updates - see Security Bulletin: NVIDIA GPU Display Driver - April 2021
• Miscellaneous bug fixes

Hardware and Software Support Introduced in Release 12.2

• Support for the following GPUs:
  • NVIDIA^® A10
  • NVIDIA RTX A5000
• Support for Red Hat Enterprise Linux 8.4 as a guest OS
• Support for Citrix Virtual Apps and Desktops version 7 2103

1.6. Updates in Release 12.1

New Features in Release 12.1

• Miscellaneous bug fixes

1.7. Updates in Release 12.0

New Features in Release 12.0

• Miscellaneous bug fixes

Hardware and Software Support Introduced in Release 12.0

• Support for the following GPUs:
  • NVIDIA A100 HGX 80GB
  • NVIDIA A40
  • NVIDIA RTX A6000
• Support for Windows 10 October 2020 Update (20H2) as a guest OS

  Windows 10 May 2021 Update (21H1), which is a bug fix release for Windows 10 October 2020 Update (20H2), is also supported.

This release family of NVIDIA vGPU software provides support for several NVIDIA GPUs on validated server hardware platforms, Citrix Hypervisor hypervisor software versions, and guest operating systems. It also supports the version of NVIDIA CUDA Toolkit that is compatible with R460 drivers.

2.1. Supported NVIDIA GPUs and Validated Server Platforms

This release of NVIDIA vGPU software provides support for the following NVIDIA GPUs on Citrix Hypervisor, running on validated server hardware platforms:

• GPUs based on the NVIDIA Maxwell™ graphic architecture:
  • Tesla M6
  • Tesla M10
  • Tesla M60
• GPUs based on the NVIDIA Pascal™ architecture:
  • Tesla P4
  • Tesla P6
  • Tesla P40
  • Tesla P100 PCIe 16 GB (XenMotion with vGPU is not supported.)
  • Tesla P100 SXM2 16 GB (XenMotion with vGPU is not supported.)
  • Tesla P100 PCIe 12GB (XenMotion with vGPU is not supported.)
• GPUs based on the NVIDIA Volta architecture:
  • Tesla V100 SXM2
  • Tesla V100 SXM2 32GB
  • Tesla V100 PCIe
  • Tesla V100 PCIe 32GB
  • Tesla V100S PCIe 32GB
  • Tesla V100 FHHL
• GPUs based on the NVIDIA Turing™ architecture:
  • Tesla T4
  • Quadro RTX 6000 in displayless mode
  • Quadro RTX 6000 passive in displayless mode
  • Quadro RTX 8000 in displayless mode
  • Quadro RTX 8000 passive in displayless mode

  In displayless mode, local physical display connectors are disabled.

• GPUs based on the NVIDIA Ampere architecture:
  • NVIDIA A100 HGX 80GB (supports only compute workloads on Linux with GPU pass through; graphics acceleration is not supported)
  • NVIDIA A100 PCIe 40GB (supports only compute workloads on Linux with GPU pass through; graphics acceleration is not supported)
  • NVIDIA A100 HGX 40GB (supports only compute workloads on Linux with GPU pass through; graphics acceleration is not supported)
  • NVIDIA A40 in displayless mode
  • Since 12.2: NVIDIA A10
  • NVIDIA RTX A6000 in displayless mode
  • Since 12.2: NVIDIA RTX A5000 in displayless mode

  In displayless mode, local physical display connectors are disabled.

For a list of validated server platforms, refer to NVIDIA GRID Certified Servers.

2.1.1. Switching the Mode of a GPU that Supports Multiple Display Modes

Some GPUs support displayless and display-enabled modes but must be used in NVIDIA vGPU software deployments in displayless mode.

The GPUs listed in the following table support multiple display modes. As shown in the table, some GPUs are supplied from the factory in displayless mode, but other GPUs are supplied in a display-enabled mode.

A GPU that is supplied from the factory in displayless mode, such as the NVIDIA A40 GPU, might be in a display-enabled mode if its mode has previously been changed.

To change the mode of a GPU that supports multiple display modes, use the displaymodeselector tool, which you can request from the NVIDIA Display Mode Selector Tool page on the NVIDIA Developer website.

2.1.2. Switching the Mode of a Tesla M60 or M6 GPU

Tesla M60 and M6 GPUs support compute mode and graphics mode. NVIDIA vGPU requires GPUs that support both modes to operate in graphics mode.

Recent Tesla M60 GPUs and M6 GPUs are supplied in graphics mode. However, your GPU might be in compute mode if it is an older Tesla M60 GPU or M6 GPU or if its mode has previously been changed.

To configure the mode of Tesla M60 and M6 GPUs, use the gpumodeswitch tool provided with NVIDIA vGPU software releases. If you are unsure which mode your GPU is in, use the gpumodeswitch tool to find out the mode.

For more information, refer to gpumodeswitch User Guide.

2.2. Hypervisor Software Releases

Changes to Citrix Product Names and Release Numbers

Citrix has changed the product names of its hypervisor and virtual desktop software.

The release number of Citrix Virtual Apps and Desktops releases after 7.18 is in the form 7 yymm, where yymm denotes the year and month that the product was released. For example, for a product released in August 2018, yymm is 1808.

For more information, see these topics in the Citrix documentation:

• New product names
• New product and component version numbers

Supported Citrix Hypervisor Releases

Supported Virtual Desktop Software Releases

2.3. Guest OS Support

NVIDIA vGPU software supports several Windows releases and Linux distributions as a guest OS. The supported guest operating systems depend on the hypervisor software version.

2.3.1. Windows Guest OS Support

2.3.2. Linux Guest OS Support

2.4. NVIDIA CUDA Toolkit Version Support

The releases in this release family of NVIDIA vGPU software support NVIDIA CUDA Toolkit 11.2.

For more information about NVIDIA CUDA Toolkit, see CUDA Toolkit 11.2 Documentation.

2.5. XenMotion with vGPU Support

XenMotion with vGPU is supported only on a subset of supported GPUs, Citrix Hypervisor releases, and guest operating systems.

Supported GPUs

• Tesla M6
• Tesla M10
• Tesla M60
• Tesla P4
• Tesla P6
• Tesla P40
• Tesla V100 SXM2
• Tesla V100 SXM2 32GB
• Tesla V100 PCIe
• Tesla V100 PCIe 32GB
• Tesla V100S PCIe 32GB
• Tesla V100 FHHL
• Tesla T4
• Quadro RTX 6000
• Quadro RTX 6000 passive
• Quadro RTX 8000
• Quadro RTX 8000 passive
• NVIDIA A10
• NVIDIA A40
• NVIDIA RTX A5000
• NVIDIA RTX A6000

Supported Citrix Hypervisor Releases

Citrix Hypervisor 8.2 only.

Supported Guest OS Releases

Windows only. XenMotion with vGPU is not supported on Linux.

Known Issues with XenMotion with vGPU Support

2.6. Multiple vGPU Support

To support applications and workloads that are compute or graphics intensive, multiple vGPUs can be added to a single VM. The assignment of more than one vGPU to a VM is supported only on a subset of vGPUs and Citrix Hypervisor releases.

Supported vGPUs

Only Q-series and C-series vGPUs that are allocated all of the physical GPU's frame buffer are supported.

Maximum vGPUs per VM

NVIDIA vGPU software supports up to a maximum of 16 vGPUs per VM on Citrix Hypervisor.

Supported Hypervisor Releases

Citrix Hypervisor 8.2 only.

2.7. Peer-to-Peer CUDA Transfers over NVLink Support

Peer-to-peer CUDA transfers enable device memory between vGPUs on different GPUs that are assigned to the same VM to be accessed from within the CUDA kernels. NVLink is a high-bandwidth interconnect that enables fast communication between such vGPUs. Peer-to-Peer CUDA transfers over NVLink are supported only on a subset of vGPUs, Citrix Hypervisor releases, and guest OS releases.

Supported vGPUs

Only Q-series and C-series vGPUs that are allocated all of the physical GPU's frame buffer on physical GPUs that support NVLink are supported.

Supported Hypervisor Releases

Peer-to-Peer CUDA Transfers over NVLink are supported on all hypervisor releases that support the assignment of more than one vGPU to a VM. For details, see Multiple vGPU Support.

Supported Guest OS Releases

Linux only. Peer-to-Peer CUDA Transfers over NVLink are not supported on Windows.

Limitations

• Only direct connections are supported. NVSwitch is not supported.
• PCIe is not supported.
• SLI is not supported.

2.8. Since 12.2: Unified Memory Support

Unified memory is a single memory address space that is accessible from any CPU or GPU in a system. It creates a pool of managed memory that is shared between the CPU and GPU to provide a simple way to allocate and access data that can be used by code running on any CPU or GPU in the system. Unified memory is supported only on a subset of vGPUs and guest OS releases.

Supported vGPUs

Only Q-series and C-series vGPUs that are allocated all of the physical GPU's frame buffer on physical GPUs that support unified memory are supported.

Supported Guest OS Releases

Linux only. Unified memory is not supported on Windows.

Limitations

• When unified memory is enabled for a VM, XenMotion with vGPU is disabled for the VM.

Known product limitations for this release of NVIDIA vGPU software are described in the following sections.

3.1. NVENC does not support resolutions greater than 4096×4096

Description

The NVIDIA hardware-based H.264/HEVC video encoder (NVENC) does not support resolutions greater than 4096×4096. This restriction applies to all NVIDIA GPU architectures and is imposed by the GPU encoder hardware itself, not by NVIDIA vGPU software. The maximum supported resolution for each encoding scheme is listed in the documentation for NVIDIA Video Codec SDK. This limitation affects any remoting tool where H.264 encoding is used with a resolution greater than 4096×4096. Most supported remoting tools fall back to software encoding in such scenarios.

Workaround

Use H.265 encoding. H.265 is more efficient than H.264 encoding and has a maximum resolution of 8192×8192.

If you are using Citrix Virtual Apps and Desktops, you can switch to using H.264 hardware encoding with the Use video codec for compression Citrix graphics policy set to to Actively Changing Regions. This policy setting encodes only actively changing regions of the screen (for example, a window in which a video is playing). Provided that the number of pixels along any edge of the actively changing region does not exceed 4096, H.264 encoding is offloaded to the NVENC hardware encoder.

3.2. Issues occur when the channels allocated to a vGPU are exhausted

Description

Issues occur when the channels allocated to a vGPU are exhausted and the guest VM to which the vGPU is assigned fails to allocate a channel to the vGPU. A physical GPU has a fixed number of channels and the number of channels allocated to each vGPU is inversely proportional to the maximum number of vGPUs allowed on the physical GPU.

When the channels allocated to a vGPU are exhausted and the guest VM fails to allocate a channel, the following errors are reported on the hypervisor host or in an NVIDIA bug report:

            

            
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0): Guest attempted to allocate channel above its max channel limit 0xfb
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0): VGPU message 6 failed, result code: 0x1a
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0):         0xc1d004a1, 0xff0e0000, 0xff0400fb, 0xc36f,
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0):         0x1, 0xff1fe314, 0xff1fe038, 0x100b6f000, 0x1000,
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0):         0x80000000, 0xff0e0200, 0x0, 0x0, (Not logged),
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0):         0x1, 0x0
Jun 26 08:01:25 srvxen06f vgpu-3[14276]: error: vmiop_log: (0x0): , 0x0
        

Workaround

Use a vGPU type with more frame buffer, thereby reducing the maximum number of vGPUs allowed on the physical GPU. As a result, the number of channels allocated to each vGPU is increased.

3.3. Total frame buffer for vGPUs is less than the total frame buffer on the physical GPU

Some of the physical GPU's frame buffer is used by the hypervisor on behalf of the VM for allocations that the guest OS would otherwise have made in its own frame buffer. The frame buffer used by the hypervisor is not available for vGPUs on the physical GPU. In NVIDIA vGPU deployments, frame buffer for the guest OS is reserved in advance, whereas in bare-metal deployments, frame buffer for the guest OS is reserved on the basis of the runtime needs of applications.

If error-correcting code (ECC) memory is enabled on a physical GPU that does not have HBM2 memory, the amount of frame buffer that is usable by vGPUs is further reduced. All types of vGPU are affected, not just vGPUs that support ECC memory.

On all GPUs that support ECC memory and, therefore, dynamic page retirement, additional frame buffer is allocated for dynamic page retirement. The amount that is allocated is inversely proportional to the maximum number of vGPUs per physical GPU. All GPUs that support ECC memory are affected, even GPUs that have HBM2 memory or for which ECC memory is disabled.

The approximate amount of frame buffer that NVIDIA vGPU software reserves can be calculated from the following formula:

max-reserved-fb = vgpu-profile-size-in-mb÷16 + 16 + ecc-adjustments + page-retirement-allocation + compression-adjustment

max-reserved-fb

The maximum total amount of reserved frame buffer in Mbytes that is not available for vGPUs.

vgpu-profile-size-in-mb

The amount of frame buffer in Mbytes allocated to a single vGPU. This amount depends on the vGPU type. For example, for the T4-16Q vGPU type, vgpu-profile-size-in-mb is 16384.

ecc-adjustments

The amount of frame buffer in Mbytes that is not usable by vGPUs when ECC is enabled on a physical GPU that does not have HBM2 memory.

• If ECC is enabled on a physical GPU that does not have HBM2 memory ecc-adjustments is fb-without-ecc/16, which is equivalent to 64 Mbytes for every Gbyte of frame buffer assigned to the vGPU. fb-without-ecc is total amount of frame buffer with ECC disabled.
• If ECC is disabled or the GPU has HBM2 memory, ecc-adjustments is 0.

page-retirement-allocation

The amount of frame buffer in Mbytes that is reserved for dynamic page retirement.

• On GPUs based on the NVIDIA Maxwell GPU architecture, page-retirement-allocation = 4÷max-vgpus-per-gpu.
• On GPUs based on NVIDIA GPU architectures after the Maxwell architecture, page-retirement-allocation = 128÷max-vgpus-per-gpu

max-vgpus-per-gpu

The maximum number of vGPUs that can be created simultaneously on a physical GPU. This number varies according to the vGPU type. For example, for the T4-16Q vGPU type, max-vgpus-per-gpu is 1.

compression-adjustment

The amount of frame buffer in Mbytes that is reserved for the higher compression overhead in vGPU types with 12 Gbytes or more of frame buffer on GPUs based on the Turing architecture.

compression-adjustment depends on the vGPU type as shown in the following table.

vGPU Type	Compression Adjustment (MB)
T4-16Q T4-16C T4-16A	28
RTX6000-12Q RTX6000-12C RTX6000-12A	32
RTX6000-24Q RTX6000-24C RTX6000-24A	104
RTX6000P-12Q RTX6000P-12C RTX6000P-12A	32
RTX6000P-24Q RTX6000P-24C RTX6000P-24A	104
RTX8000-12Q RTX8000-12C RTX8000-12A	32
RTX8000-16Q RTX8000-16C RTX8000-16A	64
RTX8000-24Q RTX8000-24C RTX8000-24A	96
RTX8000-48Q RTX8000-48C RTX8000-48A	238
RTX8000P-12Q RTX8000P-12C RTX8000P-12A	32
RTX8000P-16Q RTX8000P-16C RTX8000P-16A	64
RTX8000P-24Q RTX8000P-24C RTX8000P-24A	96
RTX8000P-48Q RTX8000P-48C RTX8000P-48A	238

For all other vGPU types, compression-adjustment is 0.

3.4. Issues may occur with graphics-intensive OpenCL applications on vGPU types with limited frame buffer

Description

Issues may occur when graphics-intensive OpenCL applications are used with vGPU types that have limited frame buffer. These issues occur when the applications demand more frame buffer than is allocated to the vGPU.

For example, these issues may occur with the Adobe Photoshop and LuxMark OpenCL Benchmark applications:

• When the image resolution and size are changed in Adobe Photoshop, a program error may occur or Photoshop may display a message about a problem with the graphics hardware and a suggestion to disable OpenCL.
• When the LuxMark OpenCL Benchmark application is run, XID error 31 may occur.

Workaround

For graphics-intensive OpenCL applications, use a vGPU type with more frame buffer.

3.5. In pass through mode, all GPUs connected to each other through NVLink must be assigned to the same VM

Description

In pass through mode, all GPUs connected to each other through NVLink must be assigned to the same VM. If a subset of GPUs connected to each other through NVLink is passed through to a VM, unrecoverable error XID 74 occurs when the VM is booted. This error corrupts the NVLink state on the physical GPUs and, as a result, the NVLink bridge between the GPUs is unusable.

Workaround

Restore the NVLink state on the physical GPUs by resetting the GPUs or rebooting the hypervisor host.

3.6. vGPU profiles with 512 Mbytes or less of frame buffer support only 1 virtual display head on Windows 10

Description

To reduce the possibility of memory exhaustion, vGPU profiles with 512 Mbytes or less of frame buffer support only 1 virtual display head on a Windows 10 guest OS.

The following vGPU profiles have 512 Mbytes or less of frame buffer:

• Tesla M6-0B, M6-0Q
• Tesla M10-0B, M10-0Q
• Tesla M60-0B, M60-0Q

Workaround

Use a profile that supports more than 1 virtual display head and has at least 1 Gbyte of frame buffer.

3.7. NVENC requires at least 1 Gbyte of frame buffer

Description

Using the frame buffer for the NVIDIA hardware-based H.264/HEVC video encoder (NVENC) may cause memory exhaustion with vGPU profiles that have 512 Mbytes or less of frame buffer. To reduce the possibility of memory exhaustion, NVENC is disabled on profiles that have 512 Mbytes or less of frame buffer. Application GPU acceleration remains fully supported and available for all profiles, including profiles with 512 MBytes or less of frame buffer. NVENC support from both Citrix and VMware is a recent feature and, if you are using an older version, you should experience no change in functionality.

The following vGPU profiles have 512 Mbytes or less of frame buffer:

• Tesla M6-0B, M6-0Q
• Tesla M10-0B, M10-0Q
• Tesla M60-0B, M60-0Q

Workaround

If you require NVENC to be enabled, use a profile that has at least 1 Gbyte of frame buffer.

3.8. VM running an incompatible NVIDIA vGPU guest driver fails to initialize vGPU when booted

Description

A VM running a version of the NVIDIA guest VM driver that is incompatible with the current release of Virtual GPU Manager will fail to initialize vGPU when booted on a Citrix Hypervisor platform running that release of Virtual GPU Manager.

A guest VM driver is incompatible with the current release of Virtual GPU Manager in either of the following situations:

• The guest driver is from a release in a branch two or more major releases before the current release, for example release 9.4.

  In this situation, the Citrix Hypervisor VM’s /var/log/messages log file reports the following error:

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  vmiop_log: (0x0): Incompatible Guest/Host drivers: Guest VGX version is older than the minimum version supported by the Host. Disabling vGPU.
          

• The guest driver is from a later release than the Virtual GPU Manager.

  In this situation, the Citrix Hypervisor VM’s /var/log/messages log file reports the following error:

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  vmiop_log: (0x0): Incompatible Guest/Host drivers: Guest VGX version is newer than the maximum version supported by the Host. Disabling vGPU.
          

In either situation, the VM boots in standard VGA mode with reduced resolution and color depth. The NVIDIA virtual GPU is present in Windows Device Manager but displays a warning sign, and the following device status:

            

            
Windows has stopped this device because it has reported problems. (Code 43)
        

Resolution

Install a release of the NVIDIA guest VM driver that is compatible with current release of Virtual GPU Manager.

3.9. Single vGPU benchmark scores are lower than pass-through GPU

Description

A single vGPU configured on a physical GPU produces lower benchmark scores than the physical GPU run in pass-through mode.

Aside from performance differences that may be attributed to a vGPU’s smaller frame buffer size, vGPU incorporates a performance balancing feature known as Frame Rate Limiter (FRL). On vGPUs that use the best-effort scheduler, FRL is enabled. On vGPUs that use the fixed share or equal share scheduler, FRL is disabled.

FRL is used to ensure balanced performance across multiple vGPUs that are resident on the same physical GPU. The FRL setting is designed to give good interactive remote graphics experience but may reduce scores in benchmarks that depend on measuring frame rendering rates, as compared to the same benchmarks running on a pass-through GPU.

Resolution

FRL is controlled by an internal vGPU setting. On vGPUs that use the best-effort scheduler, NVIDIA does not validate vGPU with FRL disabled, but for validation of benchmark performance, FRL can be temporarily disabled by specifying frame_rate_limiter=0 in the vGPU's plugin parameters.

• Citrix Hypervisor 8.1 or later: Specify frame_rate_limiter=0 in the extra_args parameter for the group to which the vGPU belongs:
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  [root@xenserver ~]# xe vgpu-param-set uuid=vgpu-uuid extra_args=frame_rate_limiter=0
          

• Citrix Hypervisor earlier than 8.1: Specify frame_rate_limiter=0 in the VM’s platform:vgpu_extra_args parameter:
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  [root@xenserver ~]# xe vm-param-set uuid=vm-uuid platform:vgpu_extra_args="frame_rate_limiter=0"
          

The setting takes effect the next time the VM is started or rebooted.

With this setting in place, the VM’s vGPU will run without any frame rate limit. The FRL can be reverted back to its default setting in one of the following ways:

• Removing the vGPU plugin's parameters:
  • Citrix Hypervisor 8.1 or later: Removing the extra_args key the from group to which the vGPU belongs
  • Citrix Hypervisor earlier than 8.1: Removing the vgpu_extra_args key from the platform parameter
• Removing frame_rate_limiter=0 from the extra_args or vgpu_extra_args key
• Setting frame_rate_limiter=1. For example:
  • Citrix Hypervisor 8.1 or later:
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    [root@xenserver ~]# xe vgpu-param-set uuid=vgpu-uuid extra_args=frame_rate_limiter=1
            

  • Citrix Hypervisor earlier than 8.1:
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    [root@xenserver ~]# xe vm-param-set uuid=vm-uuid platform:vgpu_extra_args="frame_rate_limiter=1"
            

3.10. nvidia-smi fails to operate when all GPUs are assigned to GPU pass-through mode

Description

If all GPUs in the platform are assigned to VMs in pass-through mode, nvidia-smi will return an error:

            

            
[root@xenserver-vgx-test ~]# nvidia-smi
Failed to initialize NVML: Unknown Error
        

This is because GPUs operating in pass-through mode are not visible to nvidia-smi and the NVIDIA kernel driver operating in the Citrix Hypervisordom0.

To confirm that all GPUs are operating in pass-through mode, use XenCenter’s GPU tab to review current GPU assignment:

Resolution

N/A

3.11. Windows Aero is disabled on Citrix Virtual Apps and Desktops session using 3 or 4 monitors in 2560×1600 resolution

Description

Windows Aero may be disabled when Citrix Virtual Apps and Desktops is connected to a VM with a vGPU or passthrough GPU, with 3 or 4 monitors at 2560×1600 resolution.

This limitation is a limitation of Windows 7. For details, see the Microsoft knowledge base article Desktop background disappears with very large extended desktop on Windows 7.

3.12. VMs configured with large memory fail to initialize vGPU when booted

Description

When starting multiple VMs configured with large amounts of RAM (typically more than 32GB per VM), a VM may fail to initialize vGPU. In this scenario, the VM boots in standard VGA mode with reduced resolution and color depth. The NVIDIA vGPU software GPU is present in Windows Device Manager but displays a warning sign, and the following device status:

            

            
Windows has stopped this device because it has reported problems. (Code 43)
        

The Citrix Hypervisor VM’s /var/log/messages log file contains these error messages:

            

            
vmiop_log: error: NVOS status 0x29
vmiop_log: error: Assertion Failed at 0x7620fd4b:179
vmiop_log: error: 8 frames returned by backtrace
...
vmiop_log: error: VGPU message 12 failed, result code: 0x29
...
vmiop_log: error: NVOS status 0x8
vmiop_log: error: Assertion Failed at 0x7620c8df:280
vmiop_log: error: 8 frames returned by backtrace
...
vmiop_log: error: VGPU message 26 failed, result code: 0x8
        

Resolution

vGPU reserves a portion of the VM’s framebuffer for use in GPU mapping of VM system memory. The reservation is sufficient to support up to 32GB of system memory, and may be increased to accommodate up to 64GB by specifying enable_large_sys_mem=1 in the vGPU's plugin parameters:

• Citrix Hypervisor 8.1 or later: Specify enable_large_sys_mem=1 in the extra_args parameter for the group to which the vGPU belongs:
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  [root@xenserver ~]# xe vgpu-param-set uuid=vgpu-uuid extra_args=enable_large_sys_mem=1
          

• Citrix Hypervisor earlier than 8.1: Specify enable_large_sys_mem=1 in the VM’s platform:vgpu_extra_args parameter:
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  [root@xenserver ~]# xe vm-param-set uuid=vm-uuid platform:vgpu_extra_args="enable_large_sys_mem=1"
          

The setting takes effect the next time the VM is started or rebooted. With this setting in place, less GPU FB is available to applications running in the VM. To accommodate system memory larger than 64GB, the reservation can be further increased by specifying extra_fb_reservation in the VM’s platform:vgpu_extra_args parameter, and setting its value to the desired reservation size in megabytes. The default value of 64M is sufficient to support 64GB of RAM. We recommend adding 2M of reservation for each additional 1GB of system memory. For example, to support 96GB of RAM, set extra_fb_reservation to 128:

• Citrix Hypervisor 8.1 or later:
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  extra_args="enable_large_sys_mem=1,extra_fb_reservation=128"
          

• Citrix Hypervisor earlier than 8.1:
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  platform:vgpu_extra_args="enable_large_sys_mem=1, extra_fb_reservation=128"
          

The reservation can be reverted back to its default setting in one of the following ways:

• Removing the vGPU plugin's parameters:
  • Citrix Hypervisor 8.1 or later: Removing the extra_args key the from group to which the vGPU belongs
  • Citrix Hypervisor earlier than 8.1: Removing the vgpu_extra_args key from the platform parameter
• Removing enable_large_sys_mem from the extra_args or vgpu_extra_args key
• Setting enable_large_sys_mem=0

3.13. vGPU host driver RPM upgrade fails

Description

Upgrading vGPU host driver RPM fails with an error message about failed dependencies on the console.

            

            
[root@xenserver ~]# rpm –U NVIDIA-vGPU-xenserver-6.5-352.46.x86_64.rpm
error: Failed dependencies:
       NVIDIA-vgx-xenserver conflicts with NVIDIA-vGPU-xenserver-6.5-352.46.x86_64
[root@xenserver ~]#
        

Resolution

Uninstall the older vGPU RPM before installing the latest driver.

Use the following command to uninstall the older vGPU RPM:

            

            
[root@xenserver ~]# rpm –e NVIDIA-vgx-xenserver
        

Only resolved issues that have been previously noted as known issues or had a noticeable user impact are listed. The summary and description for each resolved issue indicate the effect of the issue on NVIDIA vGPU software before the issue was resolved.

Issues Resolved in Release 12.4

No resolved issues are reported in this release for Citrix Hypervisor.

Issues Resolved in Release 12.3

Issues Resolved in Release 12.2

Issues Resolved in Release 12.1

Issues Resolved in Release 12.0

No resolved issues are reported in this release for Citrix Hypervisor.

5.1. Since 12.3: Hypervisor host reboots when multiple cloned VMs are simultaneously powered on or migrated

Description

When multiple cloned VMs are simultaneously powered on or migrated, the hypervisor host reboots. No crash dump is generated and no error messages related to the reboot are written to the log files daemon.log or kern.log.

Version

This issue affects only Citrix Hypervisor 8.2.

Status

Open

Ref. #

200726850

5.2. Since 12.3: NVENC does not work with Teradici Cloud Access Software on Windows

Description

The NVIDIA hardware-based H.264/HEVC video encoder (NVENC) does not work with Teradici Cloud Access Software on Windows. This issue affects NVIDIA vGPU and GPU pass through deployments.

This issue occurs because the check that Teradici Cloud Access Software performs on the DLL signer name is case sensitive and NVIDIA recently changed the case of the company name in the signature certificate.

Status

Not an NVIDIA bug

This issue is resolved in the latest 21.07 and 21.03 Teradici Cloud Access Software releases.

Ref. #

200749065

5.3. A licensed client might fail to acquire a license if a proxy is set

Description

If a proxy is set with a system environment variable such as HTTP_PROXY or HTTPS_PROXY, a licensed client might fail to acquire a license.

Workaround

Perform this workaround on each affected licensed client.

1. Add the address of the NVIDIA vGPU software license server to the system environment variable NO_PROXY.

   The address must be specified exactly as it is specified in the client's license server settings either as a fully-qualified domain name or an IP address. If the NO_PROXY environment variable contains multiple entries, separate the entries with a comma (,).

   If high availability is configured for the license server, add the addresses of the primary license server and the secondary license server to the system environment variable NO_PROXY.

2. Restart the NVIDIA driver service that runs the core NVIDIA vGPU software logic.

   • On Windows, restart the NVIDIA Display Container service.
   • On Linux, restart the nvidia-gridd service.

Status

Closed

Ref. #

200704733

5.4. Session connection fails with four 4K displays and NVENC enabled on a 2Q, 3Q, or 4Q vGPU

Description

Desktop session connections fail for a 2Q, 3Q, or 4Q vGPU that is configured with four 4K displays and for which the NVIDIA hardware-based H.264/HEVC video encoder (NVENC) is enabled. This issue affects only Teradici Cloud Access Software sessions on Linux guest VMs.

This issue is accompanied by the following error message:

            

            
This Desktop has no resources available or it has timed out
        

This issue is caused by insufficient frame buffer.

Workaround

Ensure that sufficient frame buffer is available for all the virtual displays that are connected to a vGPU by changing the configuration in one of the following ways:

• Reducing the number of virtual displays. The number of 4K displays supported with NVENC enabled depends on the vGPU.

  vGPU	4K Displays Supported with NVENC Enabled
  2Q	1
  3Q	2
  4Q	3

• Disabling NVENC. The number of 4K displays supported with NVENC disabled depends on the vGPU.

  vGPU	4K Displays Supported with NVENC Disabled
  2Q	2
  3Q	2
  4Q	4

• Using a vGPU type with more frame buffer. Four 4K displays with NVENC enabled on any Q-series vGPU with at least 6144 MB of frame buffer are supported.

Status

Not an NVIDIA bug

Ref. #

200701959

5.5. Disconnected sessions cannot be reconnected or might be reconnected very slowly with NVWMI installed

Description

Disconnected sessions cannot be reconnected or might be reconnected very slowly when the NVIDIA Enterprise Management Toolkit (NVWMI) is installed. This issue affects Citrix Virtual Apps and Desktops and VMware Horizon sessions on Windows guest VMs.

Workaround

Uninstall NVWMI.

Status

Open

Ref. #

3262923

5.6. 12.0-12.2 Only: Citrix XenCenter console display shows full-screen corruption with A-Series vGPUs

Description

The Citrix XenCenter console display shows full-screen corruption with A-series vGPUs. Sometimes when this issue occurs, the error message VGPU message 45 failed, result code: 0x1f is written to the Citrix Hypervisor VM’s log file /var/log/daemon.log.

Status

Resolved in NVIDIA vGPU software 12.3

Ref. #

200718945

5.7. Migrating a VM with a Tesla T4 vGPU between a host running NVIDIA vGPU software 11.3 and a host running a different release fails

Description

Migrating a VM with a Tesla T4 vGPU between hosts where one host is running NVIDIA vGPU software 11.3 and the other host is running a different release fails. After the migration, the destination host and VM become unstable.

When this issue occurs, error message XID error 38 is written to the Citrix Hypervisor VM’s log file /var/log/daemon.log. Depending on the host configurations, the following messages might also be written to the log file:

• XID error 43
• VGPU message 58
• VGPU message 4

Version

This issue affects migrations between a host that is running NVIDIA vGPU software release 11.3 and a host that is running a different release. The issue affects migrations to and from the host that is running NVIDIA vGPU software release 11.3.

This issue does not affect migrations between two hosts that are both running NVIDIA vGPU software 11.3.

Workaround

Avoid migrating a VM between a host that is running NVIDIA vGPU software 11.3 and a host that is running a different NVIDIA vGPU software release.

Status

Closed

Ref. #

200691763

200735219

5.8. 12.0 Only: Sessions freeze when Adobe Premiere with the Adobe Mercury Engine is used

Description

Sessions freeze when Adobe Premiere with the Adobe Mercury Engine is used. The session can freeze after 15-20 minutes of use or when a project is being exported.

Workaround

Status

Resolved in NVIDIA vGPU software 12.1

Ref. #

3230997

5.9. 12.0 Only: Issues occur when Blackmagic Design DaVinci Resolve is used

Description

Multiple issues, such as application crashes, application instability, and session freezes, occur when Blackmagic Design DaVinci Resolve is used. CUDA error 702 might also be observed.

Status

Resolved in NVIDIA vGPU software 12.1

Ref. #

3225521

5.10. 12.0, 12.1 Only: NVIDIA vGPU software graphics driver installation fails in Ubuntu guest VMs

Description

Installation of the NVIDIA vGPU software graphics driver from a .run file fails in Ubuntu guest VMs that are running Linux kernel version 5.8 or later.

Version

Ubuntu 20.04 LTS and 18.04 with Linux kernel version 5.8 or later

Workaround

Revert to a Linux kernel version earlier than 5.8.

Status

Resolved in NVIDIA vGPU software 12.2

Ref. #

3226853

5.11. VM hangs after vGPU migration to a host running a newer vGPU manager version

Description

When a VM configured with a Tesla V100 or Tesla T4 vGPU is migrated from a host that is running a vGPU manager 11 release to a host that is running vGPU manager 12.0, the VM hangs. When this issue occurs, XID error 31 is written to the log files on the destination hypervisor host. After the migration, the destination host and VM become unstable.

Version

This issue affects migration from a host that is running a vGPU manager 11 release, such as 11.3 or 11.2, to a host that is running vGPU manager 12.0.

Status

Open

Ref. #

200691445

5.12. Idle Teradici Cloud Access Software session disconnects from Linux VM

Description

After a Teradici Cloud Access Software session has been idle for a short period of time, the session disconnects from the VM. When this issue occurs, the error messages NVOS status 0x19 and vGPU Message 21 failed are written to the log files on the hypervisor host. This issue affects only Linux guest VMs.

Status

Open

Ref. #

200689126

5.13. vGPU migration to a host running an older vGPU manager version fails with multiple errors

Description

When a VM configured with a Tesla V100 or Tesla T4 vGPU is migrated from a host that is running vGPU manager 12.0 to a host that is running a vGPU manager 11 release, the migration fails. When this issue occurs, XID errors 44 and 43, timeout detection and recovery (TDR) errors, NVOS status 0x65, and vGPU message 22 are written to the log files on the destination hypervisor host. After the migration, the destination host and VM become unstable.

Version

This issue affects migration from a host that is running vGPU manager 12.0 to a host that is running a vGPU manager 11 release, such as 11.3 or 11.2.

This issue affects only VMs configured with a vGPU that resides on a Tesla V100 GPU or Tesla T4 GPU.

Status

Open

Ref. #

200690020

5.14. No virtual GPU types are listed in Citrix XenCenter

Description

No virtual GPU (vGPU) types are listed on the Select virtual GPU type drop-down list in Citrix XenCenter. However, the command nvidia-smi vgpu -s lists all supported vGPU types. This issue occurs because the driver version number of the Virtual GPU Manager contains multiple decimal points and is misinterpreted by Citrix XenCenter.

Version

Citrix Hypervisor 8.2

Resolution

Apply Hotfix XS82E002 - For Citrix Hypervisor 8.2 from Citrix.

Status

Not an NVIDIA bug. Resolved by Citrix in hotfix XS82E002 for Citrix Hypervisor 8.2

Ref. #

200653755

5.15. NVIDIA vGPU software graphics driver fails to load after upgrade on Citrix Hypervisor

Description

NVIDIA vGPU software graphics driver fails to load after an upgrade of NVIDIA vGPU software from an 11.x release to a 12.x release on Citrix Hypervisor. This issue occurs because the hypervisor name in the RPM package name has changed from xenserver to CitrixHypervisor.

The attempted upgrade fails its dependency checks as follows:

            

            
[root@localhost ~]# rpm -Uvh NVIDIA-vGPU-CitrixHypervisor-8.2-460.107.x86_64.rpm
error: Failed dependencies:
        NVIDIA-vGPU-xenserver conflicts with NVIDIA-vGPU-CitrixHypervisor-1:8.2-460.107.x86_64
        

Workaround

1. Determine the full name of the installed RPM package for the Virtual GPU Manager.

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   [root@localhost ~]# rpm -qa | grep NV
   NVIDIA-vGPU-xenserver-8.2-450.142.x86_64
           

2. Remove the installed RPM package for the Virtual GPU Manager.

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   [root@localhost ~]# rpm -ev NVIDIA-vGPU-xenserver-8.2-450.142.x86_64
   Preparing packages...
   NVIDIA-vGPU-xenserver-1:8.2-450.142.x86_64
           

3. Perform a fresh installation of the latest RPM package for the Virtual GPU Manager.

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   [root@localhost ~]# rpm -ivh NVIDIA-vGPU-CitrixHypervisor-8.2-460.107.x86_64.rpm
   Preparing...                          ################################# [100%]
   Updating / installing...
      1:NVIDIA-vGPU-CitrixHypervisor-1:8.################################# [100%]
           

4. Reboot the hypervisor host.

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   [root@localhost ~]# reboot
           

Status

Open

Ref. #

200682984

5.16. Windows guest VMs with vGPUs or GPUs with large BAR memory settings fail to boot to the desktop in UEFI mode

Description

Windows guest VMs configured with vGPUs or physical GPUs that have large BAR memory settings fail to boot to the desktop in UEFI mode. The VM can be reached through its IP address but the desktop session is blank after the connection to the VM is established.

By default, Citrix Hypervisor creates a VM in UEFI boot mode and the boot mode of a VM cannot be changed after the VM is created.

Version

Citrix Hypervisor 8.2

Workaround

Delete the VM and re-create it, selecting BIOS Boot mode when you specify the installation method for the OS software on the new VM.

Status

Open

Ref. #

200676622

5.17. Migrated VM with more than two vGPUs crashes on destination host

Description

When a VM that is configured with more than two vGPUs is migrated, the VM crashes on the destination host. When this issue occurs, the log file on the hypervisor host is flooded with NVOS status messages 0x23, 0x33, 0x5, and 0x21 and vGPU failure messages 4, 6, 7, 9, 12, 14, 19, 21, 23, 26, 32, 43, 54, and 56.

Status

Open

Ref. #

200660221

5.18. Driver upgrade in a Linux guest VM with multiple vGPUs might fail

Description

Upgrading the NVIDIA vGPU software graphics driver in a Linux guest VM with multiple vGPUs might fail. This issue occurs if the driver is upgraded by overinstalling the new release of the driver on the current release of the driver while the nvidia-gridd service is running in the VM.

Workaround

1. Stop the nvidia-gridd service.
2. Try again to upgrade the driver.

Status

Open

Ref. #

200633548

5.19. NVIDIA Control Panel fails to start if launched too soon from a VM without licensing information

Description

If NVIDIA licensing information is not configured on the system, any attempt to start NVIDIA Control Panel by right-clicking on the desktop within 30 seconds of the VM being started fails.

Workaround

Restart the VM and wait at least 30 seconds before trying to launch NVIDIA Control Panel.

Status

Open

Ref. #

200623179

5.20. VNC client session goes blank and console VNC is corrupted when the guest driver is uninstalled

Description

When the NVIDIA vGPU software graphics driver is uninstalled from a Windows 10 guest VM for which the boot mode is UEFI, the VNC client session goes blank and console VNC is corrupted.

This issue affects only Windows 10 guest VMs for which the boot mode is UEFI. It does not affect Windows 10 guest VMs for which the boot mode is BIOS.

Workaround

Reboot the VM by using Citrix XenCenter.

Status

Not an NVIDIA bug

Ref. #

200609669

5.21.  Citrix Virtual Apps and Desktops session corruption occurs in the form of residual window borders

Description

When a window is dragged across the desktop in a Citrix Virtual Apps and Desktops session, corruption of the session in the form of residual window borders occurs.

Version

This issue affects only Citrix Virtual Apps and Desktops version 7 2003

Workaround

Use Citrix Virtual Apps and Desktops version 7 1912 or 2006.

Status

Not an NVIDIA bug

Ref. #

200608675

5.22. Suspend and resume between hosts running different versions of the vGPU manager fails

Description

Suspending a VM configured with vGPU on a host running one version of the vGPU manager and resuming the VM on a host running a version from an older main release branch fails. For example, suspending a VM on a host that is running the vGPU manager from release 12.4 and resuming the VM on a host running the vGPU manager from release 11.6 fails. When this issue occurs, the error There were no servers available to complete the specified operation is reported on Citrix XenCenter.

Status

Not an NVIDIA bug

Ref. #

200602087

5.23. On Linux, the frame rate might drop to 1 after several minutes

Description

On Linux, the frame rate might drop to 1 frame per second (FPS) after NVIDIA vGPU software has been running for several minutes. Only some applications are affected, for example, glxgears. Other applications, such as Unigine Heaven, are not affected. This behavior occurs because Display Power Management Signaling (DPMS) for the Xorg server is enabled by default and the display is detected to be inactive even when the application is running. When DPMS is enabled, it enables power saving behavior of the display after several minutes of inactivity by setting the frame rate to 1 FPS.

Workaround

1. If necessary, stop the Xorg server.

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   # /etc/init.d/xorg stop
           

2. In a plain text editor, edit the /etc/X11/xorg.conf file to set the options to disable DPMS and disable the screen saver.

   1. In the Monitor section, set the DPMS option to false.
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      Option "DPMS" "false"
              

   2. At the end of the file, add a ServerFlags section that contains option to disable the screen saver.
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      Section "ServerFlags"
          Option "BlankTime" "0"
        EndSection
              

   3. Save your changes to /etc/X11/xorg.conf file and quit the editor.

3. Start the Xorg server.

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   # etc/init.d/xorg start
           

Status

Open

Ref. #

200605900

5.24. Citrix XenCenter displays misleading information about vGPU types

Description

The GPU type drop-down list in the Citrix XenCenter management GUI displays misleading information about the maximum combined resolution supported by Q-series and B-series vGPU types. The GUI lists the maximum number of displays supported and the highest resolution supported in a manner that implies a maximum combined resolution higher than is actually supported. These vGPU types support the number of displays listed only at resolutions lower than the resolution listed and support the resolution listed only with fewer displays than the number listed.

For example, as shown in the following screen capture, the GUI lists a resolution of 5120×2880 and four displays for the V100-1Q vGPU type. However, this vGPU type supports only one display at a resolution of 5120×2880 and supports a maximum of four displays only at resolutions of 2560×1600 and lower.

Version

All supported Citrix Hypervisor versions.

Workaround

For information about display configurations supported by Q-series and B-series vGPU types, see Virtual GPU Software User Guide.

Status

Not an NVIDIA bug

Ref. #

200556224

5.25. Citrix Virtual Apps and Desktops connection freezes initially

Description

When -0B and -0Q vGPU types are used with Citrix Virtual Apps and Desktops version 7 1903 and later versions, the session freezes or a black screen is seen when the connection is first made. When this issue occurs, the error message DXGI_ERROR_DEVICE_REMOVED is displayed. The affected versions of Citrix Virtual Apps and Desktops use Microsoft DDAPI.

Version

Citrix Virtual Apps and Desktops version 7 1903 and later versions

Workaround

Disable the use hardware encoding for video codec Citrix policy, which is enabled by default.

Status

Open

Ref. #

200494400

5.26. DWM crashes randomly occur in Windows VMs

Description

Desktop Windows Manager (DWM) crashes randomly occur in Windows VMs, causing a blue-screen crash and the bug check CRITICAL_PROCESS_DIED. Computer Management shows problems with the primary display device.

Version

This issue affects Windows 10 1809, 1903 and 1909 VMs.

Status

Not an NVIDIA bug

Ref. #

2730037

5.27. NVIDIA Control Panel fails to launch in a platform layer or published image

Description

When NVIDIA vGPU software is used with Citrix App Layering and a platform layer for a vGPU is being configured, NVIDIA Control Panel might fail to launch. The driver might be working normally or it might fail with code 31 or code 43.

For more information and a workaround for this issue, see NVDIA Control Panel fails to launch in platform layer or published image in the Citrix Support Knowledge Center.

5.28. Remote desktop session freezes with assertion failure and XID error 43 after migration

Description

After multiple VMs configured with vGPU on a single hypervisor host are migrated simultaneously, the remote desktop session freezes with an assertion failure and XID error 43. This issue affects only GPUs that are based on the Volta GPU architecture. It does not occur if only a single VM is migrated.

When this error occurs, the following error messages are logged to the Citrix Hypervisor log file/var/log/messages:

            

            
Jan  3 14:35:48 ch81-m1 vgpu-12[8050]: error: vmiop_log: NVOS status 0x1f
Jan  3 14:35:48 ch81-m1 vgpu-12[8050]: error: vmiop_log: Assertion Failed at 0x4b8cacf6:286
...
Jan  3 14:35:59 ch81-m1 vgpu-12[8050]: error: vmiop_log: (0x0): XID 43 detected on physical_chid:0x174, guest_chid:0x14
        

Status

Open

Ref. #

200581703

5.29. Citrix Virtual Apps and Desktops session freezes when the desktop is unlocked

Description

When a Citrix Virtual Apps and Desktops session that is locked is unlocked by pressing Ctrl+Alt+Del, the session freezes. This issue affects only VMs that are running Microsoft Windows 10 1809 as a guest OS.

Version

Microsoft Windows 10 1809 guest OS

Workaround

Restart the VM.

Status

Not an NVIDIA bug

Ref. #

2767012

5.30. NVIDIA vGPU software graphics driver fails after Linux kernel upgrade with DKMS enabled

Description

After the Linux kernel is upgraded (for example by running sudo apt full-upgrade) with Dynamic Kernel Module Support (DKMS) enabled, the nvidia-smi command fails to run. If DKMS is enabled, an upgrade to the Linux kernel triggers a rebuild of the NVIDIA vGPU software graphics driver. The rebuild of the driver fails because the compiler version is incorrect. Any attempt to reinstall the driver fails because the kernel fails to build.

When the failure occurs, the following messages are displayed:

            

            
-> Installing DKMS kernel module:
        ERROR: Failed to run `/usr/sbin/dkms build -m nvidia -v  460.32.03 -k 5.3.0-28-generic`: 
        Kernel preparation unnecessary for this kernel. Skipping...
        Building module:
        cleaning build area...
        'make' -j8 NV_EXCLUDE_BUILD_MODULES='' KERNEL_UNAME=5.3.0-28-generic IGNORE_CC_MISMATCH='' modules...(bad exit status: 2)
        ERROR (dkms apport): binary package for nvidia:  460.32.03 not found
        Error! Bad return status for module build on kernel: 5.3.0-28-generic (x86_64)
        Consult /var/lib/dkms/nvidia/ 460.32.03/build/make.log for more information.
        -> error.
        ERROR: Failed to install the kernel module through DKMS. No kernel module was installed;
        please try installing again without DKMS, or check the DKMS logs for more information.
        ERROR: Installation has failed. Please see the file '/var/log/nvidia-installer.log' for details.
        You may find suggestions on fixing installation problems in the README available on the Linux driver download page at www.nvidia.com.
        

Workaround

When installing the NVIDIA vGPU software graphics driver with DKMS enabled, use one of the following workarounds:

• Before running the driver installer, install the dkms package, then run the driver installer with the -dkms option.
• Run the driver installer with the --no-cc-version-check option.

Status

Not a bug.

Ref. #

2836271

5.31. On Citrix Hypervisor, all vGPUs in a VM must be of the same type

Description

When a VM on Citrix Hypervisor is configured with multiple vGPUs, all vGPUs must be of the same type. Citrix Hypervisor does not support the assignment multiple vGPUs of different types to a single VM.

What happens when you try to assign a different type of vGPU than the vGPUs already assigned to a VM depends on the Citrix utility that you are using.

• If you are using Citrix XenCenter, only vGPUs of the same type as the vGPUs already assigned are available for selection.

• If you are using the xe command, the command fails and the following error message is displayed:

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  Cannot create a virtual GPU that is incompatible with the existing types on the VM.
          

Status

Not an NVIDIA bug.

Ref. #

200568154

5.32. Console VGA cannot be disabled

Description

In Citrix Hypervisor releases since 8.1, a VM's console VGA interface cannot be disabled by using the command xe vm-param-set uuid=vm-uuid platform:vgpu_extra_args="disable_vnc=1".

This behavior is the result of the following changes that Citrix introduced in Citrix Hypervisor release 8.1:

• The command xe vm-param-set for assigning plugin configuration parameters has been withdrawn.
• Plugin parameters can no longer be set for vGPUs that were created by using Citrix XenCenter. They can be set only for vGPUs that were created from the command line by using the xe command.

Version

Since Citrix Hypervisor release 8.1

Workaround

Create the vGPU by using the xe command and specify plugin parameters for the group to which the vGPU belongs as explained in Virtual GPU Software User Guide.

Status

Not a bug

Ref. #

200569785

5.33. Console VNC is unusable with Xorg on multiple vGPUs in a VM

Description

If a Linux VM is configured with multiple vGPUs and the Xorg display server is running on more than one vGPU in the VM, severe corruption in console VNC is observed.

Workaround

Ensure that the Xorg display server is running on only one vGPU in the VM.

Status

Not an NVIDIA bug.

Ref. #

200568261

5.34. Publisher not verified warning during Windows 7 driver installation

Description

During installation of the NVIDIA vGPU software graphics driver for Windows on Windows 7, Windows warns that it can't verify the publisher of the driver software. If Device Manager is used to install the driver, Device Manager warns that the driver is not digitally signed. If you install the driver, error 52 (CM_PROB_UNSIGNED_DRIVER) occurs.

This issue occurs because Microsoft is no longer dual signing WHQL-tested software binary files by using the SHA-1 and SHA-2 hash algorithms. Instead, WHQL-tested software binary files are signed only by using the SHA-2 hash algorithm. All NVIDIA vGPU software graphics drivers for Windows are WHQL tested.

By default, Windows 7 systems cannot recognize signatures that were created by using the SHA-2 hash algorithm. As a result, software binary files that are signed only by using the SHA-2 hash algorithm are considered unsigned.

For more information, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS on the Microsoft Windows support website.

Version

Windows 7

Workaround

If you experience this issue, install the following updates and restart the VM or host before installing the driver:

• Servicing stack update (SSU) (KB4490628)
• SHA-2 update (KB4474419)

Status

Not a bug

5.35. RAPIDS cuDF merge fails on NVIDIA vGPU

Description

The merge function of the RAPIDS cuDF GPU data frame library fails on NVIDIA vGPU. This function fails because RAPIDS uses the Unified Memory feature of CUDA, which NVIDIA vGPU does not support.

Status

Open

Ref. #

2642134

5.36. Migration of VMs configured with vGPU stops before the migration is complete

Description

When a VM configured with vGPU is migrated to another host, the migration stops before it is complete. When this issue occurs, the message The VGPU is not compatible with any PGPU in the destination. appears in the Citrix XenCenter management GUI.

This issue occurs if the ECC memory configuration (enabled or disabled) on the source and destination hosts are different. The ECC memory configuration on both the source and destination hosts must be identical.

Workaround

Before attempting to migrate the VM again, ensure that the ECC memory configuration on both the source and destination hosts are identical.

Status

Not an NVIDIA bug

Ref. #

200520027

5.37. ECC memory settings for a vGPU cannot be changed by using NVIDIA X Server Settings

Description

The ECC memory settings for a vGPU cannot be changed from a Linux guest VM by using NVIDIA X Server Settings. After the ECC memory state has been changed on the ECC Settings page and the VM has been rebooted, the ECC memory state remains unchanged.

Workaround

Use the nvidia-smi command in the guest VM to enable or disable ECC memory for the vGPU as explained in Virtual GPU Software User Guide.

If the ECC memory state remains unchanged even after you use the nvidia-smi command to change it, use the workaround in Changes to ECC memory settings for a Linux vGPU VM by nvidia-smi might be ignored.

Status

Open

Ref. #

200523086

5.38. Changes to ECC memory settings for a Linux vGPU VM by nvidia-smi might be ignored

Description

After the ECC memory state for a Linux vGPU VM has been changed by using the nvidia-smi command and the VM has been rebooted, the ECC memory state might remain unchanged.

This issue occurs when multiple NVIDIA configuration files in the system cause the kernel module option for setting the ECC memory state RMGuestECCState in /etc/modprobe.d/nvidia.conf to be ignored.

When the nvidia-smi command is used to enable ECC memory, the file /etc/modprobe.d/nvidia.conf is created or updated to set the kernel module option RMGuestECCState. Another configuration file in /etc/modprobe.d/ that contains the keyword NVreg_RegistryDwordsPerDevice might cause the kernel module option RMGuestECCState to be ignored.

Workaround

This workaround requires administrator privileges.

1. Move the entry containing the keyword NVreg_RegistryDwordsPerDevice from the other configuration file to /etc/modprobe.d/nvidia.conf.
2. Reboot the VM.

Status

Open

Ref. #

200505777

5.39. Incorrect GPU type shown for Quadro RTX 8000 GPUs in Citrix XenCenter

Description

On the GPU tab in Citrix XenCenter, Quadro RTX 8000 GPUs are incorrectly shown as [QUADRO RTX 6000].

However, the virtual GPU types for a Quadro RTX 8000 GPU are listed correctly.

NVIDIA vGPU software does not support systems with a mixture of GPU types. Therefore, you can assume that any GPU in a system that you know to contain Quadro RTX 8000 GPUs that is shown as [QUADRO RTX 6000] is, in fact, a Quadro RTX 8000 GPU.

Status

Not an NVIDIA bug

Ref. #

200492607

5.40. NVIDIA Notification Icon prevents log off of Citrix Published Application user sessions

Description

By default on Windows Server operating systems, the NVIDIA Notification Icon application is started with every Citrix Published Application user session. This application might prevent the Citrix Published Application user session from being logged off even after the user has quit all other applications.

Resolution

Disable the NVIDIA Notification Icon application for Citrix Published Application user sessions as explained in Virtual GPU Software User Guide.

Status

Resolved by the provision of Windows registry keys for disabling the NVIDIA Notification Icon application for Citrix Published Application user sessions.

Ref. #

2206368

5.41. Vulkan applications crash in Windows 7 guest VMs configured with NVIDIA vGPU

Description

In Windows 7 guest VMs configured with NVIDIA vGPU, applications developed with Vulkan APIs crash or throw errors when they are launched. Vulkan APIs require sparse texture support, but in Windows 7 guest VMs configured with NVIDIA vGPU, sparse textures are not enabled.

In Windows 10 guest VMs configured with NVIDIA vGPU, sparse textures are enabled and applications developed with Vulkan APIs run correctly in these VMs.

Status

Open

Ref. #

200381348

5.42. Host core CPU utilization is higher than expected for moderate workloads

Description

When GPU performance is being monitored, host core CPU utilization is higher than expected for moderate workloads. For example, host CPU utilization when only a small number of VMs are running is as high as when several times as many VMs are running.

Workaround

Disable monitoring of the following GPU performance statistics:

• vGPU engine usage by applications across multiple vGPUs
• Encoder session statistics
• Frame buffer capture (FBC) session statistics
• Statistics gathered by performance counters in guest VMs

Status

Open

Ref. #

2414897

5.43. Frame capture while the interactive logon message is displayed returns blank screen

Description

Because of a known limitation with NvFBC, a frame capture while the interactive logon message is displayed returns a blank screen.

An NvFBC session can capture screen updates that occur after the session is created. Before the logon message appears, there is no screen update after the message is shown and, therefore, a black screen is returned instead. If the NvFBC session is created after this update has occurred, NvFBC cannot get a frame to capture.

Workaround

See Black Screen at Logon with Nvidia HDX 3D Pro enabled in the Citrix knowledge base.

Status

Not a bug

Ref. #

2115733

5.44. RDS sessions do not use the GPU with some Microsoft Windows Server releases

Description

When some releases of Windows Server are used as a guest OS, Remote Desktop Services (RDS) sessions do not use the GPU. With these releases, the RDS sessions by default use the Microsoft Basic Render Driver instead of the GPU. This default setting enables 2D DirectX applications such as Microsoft Office to use software rendering, which can be more efficient than using the GPU for rendering. However, as a result, 3D applications that use DirectX are prevented from using the GPU.

Version

• Windows Server 2019
• Windows Server 2016
• Windows Server 2012

Solution

Change the local computer policy to use the hardware graphics adapter for all RDS sessions.

1. Choose Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment.

2. Set the Use the hardware default graphics adapter for all Remote Desktop Services sessions option.

5.45. When the scheduling policy is fixed share, GPU utilization is reported as higher than expected

Description

When the scheduling policy is fixed share, GPU engine utilization can be reported as higher than expected for a vGPU.

For example, GPU engine usage for six P40-4Q vGPUs on a Tesla P40 GPU might be reported as follows:

            

            
[root@localhost:~] nvidia-smi vgpu
Mon Aug 20 10:33:18 2018
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 390.42                 Driver Version: 390.42                    |
|-------------------------------+--------------------------------+------------+
| GPU  Name                     | Bus-Id                         | GPU-Util   |
|      vGPU ID    Name          | VM ID    VM Name               | vGPU-Util  |
|===============================+================================+============|
|   0  Tesla P40                | 00000000:81:00.0               |  99%       |
|      85109 GRID P40-4Q | 85110 win7-xmpl-146048-1 | 32%    |
|      87195 GRID P40-4Q | 87196 win7-xmpl-146048-2 | 39%    |
|      88095 GRID P40-4Q | 88096 win7-xmpl-146048-3 | 26%    |
|      89170      GRID P40-4Q   | 89171    win7-xmpl-146048-4    |      0%    |
|      90475      GRID P40-4Q   | 90476    win7-xmpl-146048-5    |      0%    |
|      93363      GRID P40-4Q   | 93364    win7-xmpl-146048-6    |      0%    |
+-------------------------------+--------------------------------+------------+
|   1  Tesla P40                | 00000000:85:00.0               |   0%       |
+-------------------------------+--------------------------------+------------+
        

The vGPU utilization of vGPU 85109 is reported as 32%. For vGPU 87195, vGPU utilization is reported as 39%. And for 88095, it is reported as 26%. However, the expected vGPU utilization of any vGPU should not exceed approximately 16.7%.

This behavior is a result of the mechanism that is used to measure GPU engine utilization.

Status

Open

Ref. #

2227591

5.46. nvidia-smi reports that vGPU migration is supported on all hypervisors

Description

The command nvidia-smi vgpu -m shows that vGPU migration is supported on all hypervisors, even hypervisors or hypervisor versions that do not support vGPU migration.

Status

Closed

Ref. #

200407230

5.47. NVIDIA Control Panel Crashes in a VM connected to two 4K displays

Description

When NVIDIA Control Panel is started in a VM connected through a pass-through GPU to two 4K displays, a Citrix HDX 3D Pro Warning pop-up window opens containing the following error message:

            

            
Full screen applications are not supported on Citrix HDX 3D Pro. Press Ok to exit
        

NVIDIA Control Panel then crashes.

After the VM is rebooted, NVIDIA Control Panel is available again.

Version

Citrix Virtual Apps and Desktops 7.16

Status

Not an NVIDIA bug

Ref. #

200393766

5.48. vGPU guest VM driver not properly loaded on servers with more than 512 GB or 1 TB or more of system memory

Description

If PV IOMMU is enabled, support for vGPU is limited to servers with a maximum of 512 GB of system memory. On servers with more than 512 GB of system memory and PV IOMMU enabled, the guest VM driver is not properly loaded. Device Manager marks the vGPU with a yellow exclamation point.

If PV IOMMU is disabled, support for vGPU is limited to servers with less than 1 TB of system memory. This limitation applies only to systems with supported GPUs based on the Maxwell architecture: Tesla M6, Tesla M10, and Tesla M60. On servers with 1 TB or more of system memory, VMs configured with vGPU fail to power on. However, support for GPU pass through is not affected by this limitation.

Resolution

1. If PV IOMMU is enabled, disable it.

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   [root@xenserver ~]# /opt/xensource/libexec/xen-cmdline --set-xen iommu=dom0-passthrough
           

2. If the server has 1 TB or more of system memory, limit the amount of system memory on the server to 1 TB minus 16 GB.

   If the server has less than 1 TB or more of system memory, omit this step.

3. Reboot the server.

Status

Not an NVIDIA bug

Ref. #

1799582

5.49. Luxmark causes a segmentation fault on an unlicensed Linux client

Description

If the Luxmark application is run on a Linux guest VM configured with NVIDIA vGPU that is booted without acquiring a license, a segmentation fault occurs and the application core dumps. The fault occurs when the application cannot allocate a CUDA object on NVIDIA vGPUs where CUDA is disabled. On NVIDIA vGPUs that can support CUDA, CUDA is disabled in unlicensed mode.

Status

Not an NVIDIA bug.

Ref. #

200330956

5.50. A segmentation fault in DBus code causes nvidia-gridd to exit on Red Hat Enterprise Linux and CentOS

Description

On Red Hat Enterprise Linux 6.8 and 6.9, and CentOS 6.8 and 6.9, a segmentation fault in DBus code causes the nvidia-gridd service to exit.

The nvidia-gridd service uses DBus for communication with NVIDIA X Server Settings to display licensing information through the Manage License page. Disabling the GUI for licensing resolves this issue.

To prevent this issue, the GUI for licensing is disabled by default. You might encounter this issue if you have enabled the GUI for licensing and are using Red Hat Enterprise Linux 6.8 or 6.9, or CentOS 6.8 and 6.9.

Version

Red Hat Enterprise Linux 6.8 and 6.9

CentOS 6.8 and 6.9

Status

Open

Ref. #

• 200358191
• 200319854
• 1895945

5.51. No Manage License option available in NVIDIA X Server Settings by default

Description

By default, the Manage License option is not available in NVIDIA X Server Settings. This option is missing because the GUI for licensing on Linux is disabled by default to work around the issue that is described in A segmentation fault in DBus code causes nvidia-gridd to exit on Red Hat Enterprise Linux and CentOS.

Workaround

This workaround requires sudo privileges.

If you are licensing a physical GPU for vCS, you must use the configuration file /etc/nvidia/gridd.conf.

1. If NVIDIA X Server Settings is running, shut it down.

2. If the /etc/nvidia/gridd.conf file does not already exist, create it by copying the supplied template file /etc/nvidia/gridd.conf.template.

3. As root, edit the /etc/nvidia/gridd.conf file to set the EnableUI option to TRUE.

4. Start the nvidia-gridd service.

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   # sudo service nvidia-gridd start
           

When NVIDIA X Server Settings is restarted, the Manage License option is now available.

Status

Open

5.52. Licenses remain checked out when VMs are forcibly powered off

Description

NVIDIA vGPU software licenses remain checked out on the license server when non-persistent VMs are forcibly powered off.

The NVIDIA service running in a VM returns checked out licenses when the VM is shut down. In environments where non-persistent licensed VMs are not cleanly shut down, licenses on the license server can become exhausted. For example, this issue can occur in automated test environments where VMs are frequently changing and are not guaranteed to be cleanly shut down. The licenses from such VMs remain checked out against their MAC address for seven days before they time out and become available to other VMs.

Resolution

If VMs are routinely being powered off without clean shutdown in your environment, you can avoid this issue by shortening the license borrow period. To shorten the license borrow period, set the LicenseInterval configuration setting in your VM image. For details, refer to Virtual GPU Client Licensing User Guide.

Status

Closed

Ref. #

1694975

5.53. Memory exhaustion can occur with vGPU profiles that have 512 Mbytes or less of frame buffer

Description

Memory exhaustion can occur with vGPU profiles that have 512 Mbytes or less of frame buffer.

This issue typically occurs in the following situations:

• Full screen 1080p video content is playing in a browser. In this situation, the session hangs and session reconnection fails.
• Multiple display heads are used with Citrix Virtual Apps and Desktops or VMware Horizon on a Windows 10 guest VM.
• Higher resolution monitors are used.
• Applications that are frame-buffer intensive are used.
• NVENC is in use.

To reduce the possibility of memory exhaustion, NVENC is disabled on profiles that have 512 Mbytes or less of frame buffer.

When memory exhaustion occurs, the NVIDIA host driver reports Xid error 31 and Xid error 43 in the Citrix Hypervisor/var/log/messages file.

The following vGPU profiles have 512 Mbytes or less of frame buffer:

• Tesla M6-0B, M6-0Q
• Tesla M10-0B, M10-0Q
• Tesla M60-0B, M60-0Q

The root cause is a known issue associated with changes to the way that recent Microsoft operating systems handle and allow access to overprovisioning messages and errors. If your systems are provisioned with enough frame buffer to support your use cases, you should not encounter these issues.

Workaround

• Use an appropriately sized vGPU to ensure that the frame buffer supplied to a VM through the vGPU is adequate for your workloads.
• Monitor your frame buffer usage.
• If you are using Windows 10, consider these workarounds and solutions:

  • Use a profile that has 1 Gbyte of frame buffer.

  • Optimize your Windows 10 resource usage.

    To obtain information about best practices for improved user experience using Windows 10 in virtual environments, complete the NVIDIA GRID vGPU Profile Sizing Guide for Windows 10 download request form.

    For more information, see also Windows 10 Optimization for XenDesktop on the Citrix blog.

Status

Open

Ref. #

• 200130864
• 1803861

5.54. VM bug checks after the guest VM driver for Windows 10 RS2 is installed

Description

When the VM is rebooted after the guest VM driver for Windows 10 RS2 is installed, the VM bug checks. When Windows boots, it selects one of the standard supported video modes. If Windows is booted directly with a display that is driven by an NVIDIA driver, for example a vGPU on Citrix Hypervisor, a blue screen crash occurs.

This issue occurs when the screen resolution is switched from VGA mode to a resolution that is higher than 1920×1200.

Fix

Download and install Microsoft Windows Update KB4020102 from the Microsoft Update Catalog.

Workaround

If you have applied the fix, ignore this workaround.

Otherwise, you can work around this issue until you are able to apply the fix by not using resolutions higher than 1920×1200.

1. Choose a GPU profile in Citrix XenCenter that does not allow resolutions higher than 1920×1200.
2. Before rebooting the VM, set the display resolution to 1920×1200 or lower.

Status

Not an NVIDIA bug

Ref. #

200310861

5.55. On Citrix Hypervisor 7.0, VMs unexpectedly reboot and Citrix Hypervisor crashes or freezes

Description

On Citrix Hypervisor 7.0, VMs to which a vGPU is attached unexpectedly reboot and Citrix Hypervisor crashes or freezes.

The event log in the Citrix Hypervisor/var/log/crash/xen.log file lists the following errors:

• A fatal bus error on a component at the slot where the GPU card is installed
• A fatal error on a component at bus 0, device 2, function 0

This issue occurs when page-modification logging (PML) is enabled on Intel Broadwell CPUs running Citrix Hypervisor 7.0. Citrix is aware of this issue and is working on a permanent fix.

Workaround

Disable page-modification logging (PML) as explained in XenServer 7 host crash while starting multiple virtual machines in the Citrix Support Knowledge Center.

Status

Not an NVIDIA bug

Ref. #

1853248

5.56. With no NVIDIA driver installed, Citrix Hypervisor misidentifies Tesla M10 cards

Description

An erroneous entry in the pci.ids database causes Citrix Hypervisor to identify Tesla M10 cards as GRID M40 when no NVIDIA driver is installed.

Version

Citrix Hypervisor 6.5 and 7.0

Workaround

None

Status

Not an NVIDIA bug

Ref. #

NVIDIA-420/1792341

5.57. GNOME Display Manager (GDM) fails to start on Red Hat Enterprise Linux 7.2 and CentOS 7.0

Description

GDM fails to start on Red Hat Enterprise Linux 7.2 and CentOS 7.0 with the following error:

            

            
Oh no! Something has gone wrong!
        

Workaround

Permanently enable permissive mode for Security Enhanced Linux (SELinux).

1. As root, edit the /etc/selinux/config file to set SELINUX to permissive.
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   SELINUX=permissive
           

2. Reboot the system.
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   ~]# reboot
           

For more information, see Permissive Mode in Red Hat Enterprise Linux 7 SELinux User's and Administrator's Guide.

Status

Not an NVIDIA bug

Ref. #

200167868

5.58. Video goes blank when run in loop in Windows Media Player

Description

When connected to a vGPU-enabled VM using Citrix Virtual Apps and Desktops, a video played back in looping mode on Windows Media Player goes blank or freezes after a few iterations.

Workaround

None

Status

Not an NVIDIA bug

Ref. #

1306623

5.59. Local VGA console is momentarily unblanked when Citrix Virtual Apps and Desktops changes resolution of the VM desktop

Description

When Citrix Virtual Apps and Desktops establishes a remote connection to a VM using vGPU, the VM’s local VGA console display in XenCenter is blanked (assuming the VM local console has not been disabled by setting disable_vnc=1 in the vGPU plugin's parameters). If the Citrix Virtual Apps and Desktops session changes resolution of the VM’s desktop, the local VGA console momentarily unblanks, allowing a XenCenter user to briefly view the desktop.

Workaround

Disable the VM’s local VGA console.

• Citrix Hypervisor 8.1 or later:
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  [root@xenserver ~]# xe vgpu-param-set uuid=vgpu-uuid extra_args=disable_vnc=1
          

• Citrix Hypervisor earlier than 8.1:
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  xe vm-param-set uuid=vm-uuid platform:vgpu_extra_args="disable_vnc=1"
          

Status

Open

Ref. #

NVIDIA-145/1375164

5.60. VM bugchecks on shutdown/restart when Citrix Virtual Apps and Desktops is installed and NVIDIA driver is uninstalled or upgraded.

Description

If the Citrix Virtual Apps and Desktops agent is installed in a VM before any NVIDIA GPU driver is installed, the VM will bugcheck (bluescreen) when the NVIDIA driver is subsequently upgraded or uninstalled. The bugcheck code is 0x7E, SYSTEM_THREAD_EXCEPTION_NOT_HANDLED.

Workaround

Use one of the following workarounds:

• Do a force shutdown of the VM and restart it.
• Install the NVIDIA driver in guest VMs before installing Citrix Virtual Apps and Desktops.

Status

Open

Ref. #

NVIDIA-295/200018125

5.61. Application frame rate may drop when running Citrix Virtual Apps and Desktops at 2560×1600 resolution.

Description

An application’s rendering frame rate may drop when running Citrix Virtual Apps and Desktops at 2560×1600 resolution, relative to the frame rate obtained at lower resolutions.

Fix

Using the Windows regedit utility within the VM, open the HKLM\SOFTWARE\Citrix\Graphics registry key and create a new DWORD value, EncodeSpeed, with a value of 2. Reboot the VM. This setting may improve the delivered frame rate at the expense of a reduction in image quality.

Status

Open

Ref. #

NVIDIA-190/1416336

5.62. Windows VM BSOD

Description

Windows VM bugchecks on Citrix Hypervisor when running a large number of vGPU based VMs.

The Citrix Hypervisor/var/log/messages file contains these error messages:

            

            
NVRM: Xid (PCI:0000:08:00): 31, Ch 0000001e, engmask 00000111, intr 10000000
NVRM: Xid (PCI:0000:08:00): 31, Ch 00000016, engmask 00000111, intr 10000000
...
vmiop_log: error: Assertion Failed at 0xb5b898d8:4184
vmiop_log: error: 8 frames returned by backtrace
vmiop_log: error: /usr/lib/libnvidia-vgx.so(_nv000793vgx+0x69d) [0xb5b8064d]
vmiop_log: error: /usr/lib/libnvidia-vgx.so(_nv000479vgx+0x118) [0xb5b898d8]
vmiop_log: error: /usr/lib/libnvidia-vgx.so(_nv000782vgx+0x59) [0xb5b85f49]
vmiop_log: error: /usr/lib/libnvidia-vgx.so(_nv000347vgx+0x3db) [0xb5b932db]
vmiop_log: error: /usr/lib/libnvidia-vgx.so [0xb5b78e4a]
vmiop_log: error: /usr/lib/xen/bin/vgpu [0x80554be]
vmiop_log: error: /lib/libpthread.so.0 [0xb7612912]
vmiop_log: error: /lib/libc.so.6(clone+0x5e) [0xb76fc5ee]
vmiop_log: error: failed to initialize guest PTE entries
vmiop_log: error: failed to fill up guest PTE entries 3
vmiop_log: error: VGPU message 27 failed, result code: 0xff000003
vmiop_log: error:         0xc1d00001, 0xff010000, 0x1a77ba000, 0x0, 0x1, 
vmiop_log: error:         0x1, 0x1000, 0x10202, 0xc1d00001, 0xff010000, 
vmiop_log: error:         0xcaf00004, 0x0
vmiop_log: error: Timeout occurred, reset initiated.
        

Version

Citrix Hypervisor 6.2

Fix

Ensure that you are running the latest OEM firmware for your NVIDIA vGPU software boards.

Status

Closed

Ref. #

NVIDIA-327/1632120

5.63. Windows VM BSOD when upgrading NVIDIA drivers over a Citrix Virtual Apps and Desktops session

Description

Windows VM bugchecks when NVIDIA guest drivers are upgraded over a Citrix Virtual Apps and Desktops session.

If the VM is restarted after the bugcheck, the upgraded driver loads correctly and full functionality is available.

Fix

Upgrade Citrix Virtual Apps and Desktops to 7.6 Feature Pack 3

Status

Closed

Ref. #

NVIDIA-370/200130780

5.64. XenCenter does not allow vGPUs to be selected as a GPU type for Linux VMs

Description

When creating a new Linux VM or editing the properties of an existing Linux VM, XenCenter does not allow vGPUs to be selected as a GPU type.

vGPU on Linux VMs is supported as a technical preview on Citrix Hypervisor 6.5, and does include XenCenter integration.

Version

Affects the XenCenter integration with Citrix Hypervisor 6.5 only.

Resolved in the XenCenter integration with Citrix Hypervisor 7.0.

Workaround

Refer to XenServer vGPU Management in Virtual GPU Software User Guide for how to configure vGPU by using the xe CLI.

Status

Closed

Ref. #

NVIDIA-360

5.65. If X server is killed on a RHEL7 VM running vGPU, XenCenter console may not automatically switch to text console

Description

If X server is killed on a RHEL7 VM running vGPU, XenCenter console may display a corrupted image and fail to switchover to text console.

The failure to switchover to text console is due to a bug in RHEL7, which causes X server to not start correctly under certain configurations.

Workaround

Use CTRL+ALT+F1, F2, or F3 to switch between Linux terminals.

Status

Closed

Ref. #

NVIDIA-350/200123378

5.66. Citrix Virtual Apps and Desktops shows only a black screen when connected to a vGPU VM

Description

Citrix Virtual Apps and Desktops sometimes displays only a black screen when it is connected to an NVIDIA vGPU VM. The probable cause is that the display that is connected to the NVIDIA vGPU is entering a lower power state.

Fix

Disable all display-related power management settings.

For detailed instructions, visit Microsoft power plans frequently asked questions and from the list, select your OS version.

Status

Not an NVIDIA bug

Ref. #

1719877

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