You were right, this seems nouveau related. I switched to the official 
nvidia driver and it is working.

But i am not sure if VGL_FORCEALPHA=1 would have fixed this. I remember 
trying that without success when i used nouveau since it was suggested 
here: 
https://wiki.archlinux.org/index.php/VirtualGL#Problem:_rendering_glitches,_unusually_poor_performance,_or_application_errors

But i could be wrong.

Thank you!
On Monday, 21 September 2020 at 03:35:04 UTC+2 DRC wrote:

> That error probably means that the driver (nouveau?) places 10-bpc 
> GLXFBConfigs at the head of the list. AMDGPU does that, too. I have a 
> workaround for that issue but was waiting until other AMDGPU issues were 
> resolved by AMD. In the meantime, try setting VGL_FORCEALPHA=1 to encourage 
> VGL to use an 8-bpc GLXFBConfig.
>
> On Sep 20, 2020, at 9:03 AM, zoidby <[email protected]> wrote:
>
> Hi
>
>
>
> When i run glxgears, i get this error:
>
> > vglrun glxgears
> [VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to
> [VGL] 10.0.0.3, the IP address of your SSH client.
> [VGL] ERROR: in sendVGL--
> [VGL] 477: The VGL Transport requires 8 bits per component
>
>
> But glxspheres64 works:
>
> > vglrun glxspheres64
> [VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to
> [VGL] 10.0.0.3, the IP address of your SSH client.
> Polygons in scene: 62464 (61 spheres * 1024 polys/spheres)
> GLX FB config ID of window: 0xb5 (8/8/8/8)
> Visual ID of window: 0x20
> Context is Direct
> OpenGL Renderer: NV106
> 101.623796 frames/sec - 113.412157 Mpixels/sec
> 101.201136 frames/sec - 112.940467 Mpixels/sec
> 101.317899 frames/sec - 113.070776 Mpixels/sec
> 101.085025 frames/sec - 112.810888 Mpixels/sec
>
>
> The same goes for other programs. Warsow works, quake3 does not.
>
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