Op Sun, 10 Aug 2014 04:32:00 +0200 schreef Hugo Vanwoerkom
<hvw59...@care2.com>:
<snip>
Could you elaborate? You mean that if you connect, lets say a ps/2
keyboard and an USB keyboard, 2 Nvidia video cards with 2 monitors
attached and 2 USB mice and I run systemd, then it will figure out
how to make a 2-seater out of this. Meaning 2 users logged on
simultaneously. Surely you must set up a proper xorg.conf, how much
should it contain? Have you actually tried this or is it your
conclusion that "systemd ought to do this"?
Hugo
Three steps are necessary:
1 - Create a /etc/X11/xorg.conf.d/90-nvidia.conf
Unfortunately, this step is always required for a Nvidia card, only
the "MatchSeat" option has to be added.
(note, I don't have a xorg.conf file)
cat /etc/X11/xorg.conf.d/90-nvidia.conf
Section "Device"
Identifier "Seat0"
Driver "nvidia"
BusID "PCI:1:0:0"
Option "ProbeAllGpus" "FALSE"
MatchSeat "seat0"
EndSection
Section "Device"
Identifier "Seat1"
Driver "nvidia"
BusID "PCI:2:0:0"
Option "ProbeAllGpus" "FALSE"
MatchSeat "seat1"
EndSection
2 - Tag the Nvidia card for seat1 as a "master-of-seat"
This step is a litter harder. Since you have to figure out where your
Nvidia card is. If your card has hdmi you can find the location by
looking at the sound card.
$ loginctl seat-status seat0
...
├─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.1/sound/card1
│ sound:card1 "NVidia"
...
The video part will be
/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.0
Write an udev rule
cat /etc/udev/rules.d/72-seat-1.rules
SUBSYSTEM=="pci",
DEVPATH=="/devices/pci0000:00/0000:00:05.0/0000:02:00.0", TAG+="seat",
TAG+="master-of-seat", ENV{ID_AUTOSEAT}="1", ENV{ID_SEAT}="seat1"
reboot or use 'udevadm trigger' to apply the new rule
3 - Attach a mouse, keyboard and soundcard
Use loginctl seat-status seat0 to find your devices and "move" them to
seat1 with
loginctl attach seat1 <your device>
If you use a usb-hub for the mouse and keyboard attach the hub, so
every device you plug into the hub will attached to seat1
You can verify your setup with
$ loginctl seat-status seat1
seat1
Sessions: *c2
Devices:
├─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.0
│ [MASTER] pci:0000:02:00.0
├─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.1/sound/card1
│ sound:card1 "NVidia"
│
├─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.1/sound/card1/input14
│ │ input:input14 "HDA NVidia HDMI/DP,pcm=3"
│
└─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.1/sound/card1/input15
│ input:input15 "HDA NVidia HDMI/DP,pcm=7"
...
Finally,
Step 1 is always necessary for a Nvidia card. I don't know if the
nvidia-xconfig program is able to add the "MatchSeat" option. Don't
use the xorg.conf file, because only seat0 will use it. So the X
server on seat1 will give you an error "No device found"
Maybe the Nvidia Maintainers will help us in the future with Step 2. I
think it is possible that all Nvidia graphic devices get the
"master-of-seat" tag. I will ask them.
Step 3 is always required for a multiseat setup. Unless you have a
open source displaylink device.
succes,
