Kernel problem with multiseat on one card

[Bagas Sanjaya]

On Thu, Nov 30, 2023 at 11:48:24AM +0100, Gert Vanhaerents wrote:
> Hi Kernel list,
> I'm the IT person of a school, earlier we used multiseatcomputers for the
> school, i have maded with a XGL implementation and it works fine but not so
> fantastic. The school wants that i build new computers but the XGL project
> is too outdated so i can't use it anymore.
> 
> How can i make a multiseatcomputer with more then one user on one card with
> systemd? I have asked already to the makers of systemd but they said it's a
> kernel problem.
> 
> With Systemd loginctl and the nouveau drivers you have this:
> 
> ─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0
>           │ [MASTER] drm:card0
>           │
> ├─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0/card0-DVI-D-1
>           │ │ [MASTER] drm:card0-DVI-D-1
>           │
> ├─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0/card0-HDMI-A-1
>           │ │ [MASTER] drm:card0-HDMI-A-1
>           │
> └─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0/card0-VGA-1
>           │   [MASTER] drm:card0-VGA-1
> ├─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/renderD128
>           │ drm:renderD128
> ├─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/graphics/fb0
>           │ graphics:fb0 "nouveaudrmfb"
> 
> So it will be:
> 
> loginctl attach seat1 /sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0/card0-VGA-1
> 
> For the seat1 (the VGA d-sub output for seat1 and the other HDMI output for
> seat0) and of course the mouse and keyboard.
> 
> When you do this, all the graphics outputs are on the second seat (seat1)
> and not anymore on the first seat. So i need to move only the VGA output to
> seat1 and not all the outputs.

Do you expect that GUI output is on both seats?

> 
> 
> When i install the proprietary Nvidia drivers, i have the following:
> 
> [MASTER] pci:0000:08:00.0
>           │ ├─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0
>           │ │ [MASTER] drm:card0
>           │
> └─/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/renderD128
>           │   drm:renderD128
> 
> ─/sys/devices/platform/efi-framebuffer.0/graphics/fb0
>           │ graphics:fb0 "EFI VGA"
> 
> So no VGA, DVI or HDMI items.

Then report to the GitHub tracker [1].

Thanks.

[1]: https://github.com/NVIDIA/open-gpu-kernel-modules/issues

-- 
An old man doll... just what I always wanted! - Clara
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