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Module load failed during VIB downgrade from R390 to R384#

Description#

Some registry keys are available only with the R390 Virtual GPU Manager, for example, NVreg_IgnoreMMIOCheck. If any keys that are available only with the R390 Virtual GPU Manager are set, the NVIDIA module fails to load after a downgrade from R390 to R384.

When nvidia-smi is run without any arguments to verify the installation, the following error message is displayed:

NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

Workaround#

Before uninstalling the R390 VIB, clear all parameters of the nvidia module to remove any registry keys that are available only for the R390 Virtual GPU Manager.

# esxcli system module parameters set -p "" -m nvidia

Status#

Not an NVIDIA bug

Ref. ##

200366884