The headless mode works for all GPUs I've tested so far without 
UseDisplayDevice "None", including V100's. I'm thinking the 
"--use-display-device=None" breaks some subset of headless GPU/driver 
combinations. So...beyond some Nvidia driver version, some GPU's will break 
with this option. All GPU's I've tested work OK without this option, at 
Nvidia driver 455.32.00.

DRC, let me know if you want me to do some troubleshooting for you. Happy 
to help the project where I can.  I am removing this from option from our 
xorg.conf deployment mechanism. If I get  any complaints, I'll dig in and 
let you know wht I find.

On Tuesday, March 2, 2021 at 10:11:30 AM UTC-7 DRC wrote:

> What do they propose instead?  Is headless operation no longer supported 
> with Tesla GPUs?
> On 3/2/21 11:03 AM, Youssef GHORBAL wrote:
>
> Hi, 
>
> Last time I asked Nvidia about this very message they give me this 
> feedback:
>
> "This is due to a change in our driver. And you are right, you need to 
> remove the Option "UseDisplayDevice" "none" from the Xorg conf file. See 
> release not here: 
> https://docs.nvidia.com/datacenter/tesla/tesla-release-notes-440-3301/index.html
>  (section 
> 1.3 Known Issues / NoScanout Mode)
> As you pointed out this is harmless. Nevertheless, I am hoping this will 
> be improved in a future release."
>
> Bascially, the error message is somehow misleading and has nothing to do 
> with GRID technology at all.
>
> Youssef
> --------------------
>
> On 2 Mar 2021, at 17:42, qwofford <[email protected]> wrote:
>
> Hello,
>
> I'm using VirtualGL 2.6.2 with a Tesla V100 in headless mode, and NVIDIA 
> driver v455.32.00. It appears that my config file, as generated by the 
> Headless Nvidia mini How-To, is conflicting with the V100 as configured. 
>
> (EE) NVIDIA(GPU-0): UseDisplayDevice "None" is not supported with GRID
> (EE) NVIDIA(GPU-0):     displayless
>
> Is this something you've seen before? Looking at how to disable GRID vGPU 
> support now, which I hope will solve the problem...
>
> Thanks,
> Quincy
>
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