Known issue with nVidia 440.xx.  Refer to:

https://github.com/VirtualGL/virtualgl/issues/120#issuecomment-614331680

https://github.com/VirtualGL/virtualgl/issues/120#issuecomment-624904532

for workaround and further information.

On 11/18/20 1:06 PM, Bennie Lunsford wrote:
> I have loaded virtual gl on a RHEL 7.9 machine with a quadro rtx 4000
> card. I also have a 7.8 machine with the same card. Only getting 1FPS
> running GLXgears through VGL. 
>
> These machines are identical, but one was built a few months ago. I
> never noticed the slow frame rate, because the machine isn't
> production yet. 
>
> I got this error while setting up the new machine and I am not sure if
> I got it on the other one during setup. I dropped to init 3 and tried
> to run the command, but it fails too. I also killed all X running to
> try and run the command with no luck. 
>
> Any help would be appreciated.
>
> ... Modifying /etc/security/console.perms to disable automatic permissions
>     for DRI devices ...
> ... Creating /etc/modprobe.d/virtualgl.conf to set requested
> permissions for
>     /dev/nvidia* ...
> ... Attempting to remove nvidia module from memory so device permissions
>     will be reloaded ...
> rmmod: ERROR: Module nvidia is in use by: nvidia_modeset
> ... Granting write permission to /dev/dri/card0 for all users ...
> ... Modifying /etc/X11/xorg.conf.d/99-virtualgl-dri to enable DRI
> permissions
>     for all users ...
> ... /etc/X11/xorg.conf has been saved as /etc/X11/xorg.conf.orig.vgl ...
> ... Modifying /etc/X11/xorg.conf to enable DRI permissions
>     for all users ...
> ... /etc/gdm/Init/Default has been saved as
> /etc/gdm/Init/Default.orig.vgl ...
> ... Adding xhost +LOCAL: to /etc/gdm/Init/Default script ...
> ... Creating /usr/share/gdm/greeter/autostart/virtualgl.desktop ...
> ... Enabling XTEST extension in /etc/gdm/custom.conf ...
> ... Setting default run level to 5 (enabling graphical login prompt) ...
> ... Commenting out DisallowTCP line (if it exists) in
> /etc/gdm/custom.conf ...
>
> Done. You must restart the display manager for the changes to take effect.
>
> IMPORTANT NOTE: Your system uses modprobe.d to set device permissions. You
> must execute rmmod nvidia with the display manager stopped in order
> for the
> new device permission settings to become effective.
>
>
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