Yes, the Headless nVidia Mini How-To covers both issues:

https://virtualgl.org/Documentation/HeadlessNV

But it should be noted that the DPMS issue exists irrespective of whether the 
GPU is headless.

> On Aug 29, 2020, at 1:49 PM, Eric Frey <ecf...@gmail.com> wrote:
> 
> One more thing: to get it to work without a monitor connected I added 
> Option "AllowEmptyInitialConfiguration" "true"
> to the Device section.
> 
>> On Saturday, August 29, 2020 at 2:24:47 PM UTC-4 Eric Frey wrote:
>> I was having the same issue with version 450.66 on a CentOS 7 system. 
>> Commenting out Option "DPMS" in the monitor section and adding Option 
>> "hardpms" "false" as suggested by Patrik Pira fixed the problem. Many thanks 
>> for the posts.
>> 
>>> On Monday, February 3, 2020 at 4:16:43 PM UTC-5 Patrik Pira wrote:
>>> Looks like the Nvidia driver version 440.59 might be fixed now. I have not 
>>> tried it though.
>>> 
>>> From the releasenotes:
>>> - Disabled frame rate limiting for configurations without active displays 
>>> when HardDPMS is enabled.
>>> 
>>> Den fre 6 dec. 2019 15:22Patrik Pira <flutt...@gmail.com> skrev:
>>>> From the changelog for 440.26:
>>>> 
>>>> - Enabled HardDPMS by default. See the README entry on the X configuration
>>>>       option "HardDPMS" for more information.
>>>> 
>>>> Try,
>>>> 
>>>> Option "HardDPMS" "false"
>>>> 
>>>> 
>>>>> Den lördag 19 oktober 2019 kl. 10:47:32 UTC+2 skrev ziegler:
>>>>> I have set up VirtualGL to run OpenGL applications on an Nvidia card 
>>>>> through TurboVNC.
>>>>> 
>>>>> I run lightdm display manager, and a mate-session.
>>>>> 
>>>>> Based on what glxinfo tells me, the setup seems to be working:
>>>>> 
>>>>> "OpenGL vendor string: NVIDIA Corporation
>>>>> OpenGL renderer string: GeForce GTX 1650/PCIe/SSE2
>>>>> OpenGL core profile version string: 4.6.0 NVIDIA 440.26"
>>>>> 
>>>>> I now have the strange effect that basically any application (I have 
>>>>> tried glxgears, glxspheres and my own custom code) that I run through 
>>>>> vglrun runs with exactly 1.00 FPS (check the screenshot below).
>>>>> 
>>>>> The CPU usage while running is negligible, so I assume that there is some 
>>>>> artificial throttling happening, like some bogus VSYNC.
>>>>> 
>>>>> One thing special maybe about my setup is that this is a rack mount 
>>>>> server, which, appart from the discrete Nvidia card, also has an onboard 
>>>>> VGA which runs GL via mesa, so this is a dual head setup.
>>>>> 
>>>>> I separately tried
>>>>> 
>>>>> VGL_SPOILLAST=0
>>>>> VLS_SYNC=1
>>>>> 
>>>>> With no noticeable effect.
>>>>> 
>>>>> Has anybody experienced this strange effect? Any ideas on how to solve it?
>>>>> 
>>>>> Any hint is appreciated, Thanks!
>>>>> 
>>>>> Julius
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>> 
>>> 
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