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Date:   Sat, 2 Dec 2023 20:18:02 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
To:     Gert Vanhaerents <gert.vanhaerents@hotmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux DRI Development <dri-devel@lists.freedesktop.org>,
        Linux Nouveau <nouveau@lists.freedesktop.org>
Cc:     Karol Herbst <kherbst@redhat.com>, Lyude Paul <lyude@redhat.com>,
        Danilo Krummrich <dakr@redhat.com>
Subject: Re: Kernel problem with multiseat on one card
Message-ID: <ZWsuiq7zrYS-pDli@archie.me>
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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 is too outdated so i can't use it anymore.
>=20
> How can i make a multiseatcomputer with more then one user on one card wi=
th
> systemd? I have asked already to the makers of systemd but they said it's=
 a
> kernel problem.
>=20
> With Systemd loginctl and the nouveau drivers you have this:
>=20
> =E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 [MASTER] drm:card0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82
> =E2=94=9C=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/c=
ard0/card0-DVI-D-1
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 =E2=94=82 [MASTER]=
 drm:card0-DVI-D-1
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82
> =E2=94=9C=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/c=
ard0/card0-HDMI-A-1
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 =E2=94=82 [MASTER]=
 drm:card0-HDMI-A-1
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82
> =E2=94=94=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/c=
ard0/card0-VGA-1
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82=C2=A0=C2=A0 [MASTE=
R] drm:card0-VGA-1
> =E2=94=9C=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/r=
enderD128
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 drm:renderD128
> =E2=94=9C=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/graph=
ics/fb0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 graphics:fb0 "nouv=
eaudrmfb"
>=20
> So it will be:
>=20
> loginctl attach seat1 /sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/d=
rm/card0/card0-VGA-1
>=20
> For the seat1 (the VGA d-sub output for seat1 and the other HDMI output f=
or
> seat0) and of course the mouse and keyboard.
>=20
> 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?

>=20
>=20
> When i install the proprietary Nvidia drivers, i have the following:
>=20
> [MASTER] pci:0000:08:00.0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 =E2=94=9C=E2=94=80=
/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/card0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 =E2=94=82 [MASTER]=
 drm:card0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82
> =E2=94=94=E2=94=80/sys/devices/pci0000:00/0000:00:03.1/0000:08:00.0/drm/r=
enderD128
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82=C2=A0=C2=A0 drm:re=
nderD128
>=20
> =E2=94=80/sys/devices/platform/efi-framebuffer.0/graphics/fb0
> =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0 =E2=94=82 graphics:fb0 "EFI =
VGA"
>=20
> 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

--=20
An old man doll... just what I always wanted! - Clara

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