[systemd-devel] Multi seats setup How-to

[Floris]

Op Thu, 03 Sep 2015 13:51:06 +0200 schreef arnaud gaboury  
<arnaud.gaboury at gmail.com>:

> On Thu, Sep 3, 2015 at 1:26 PM, arnaud gaboury  
> <arnaud.gaboury at gmail.com> wrote:
>> I plan to use the systemd mutli-seat features, but I am not sure at
>> all how I must proceed and in waht order. I understand the main
>> principle for mouse and keyboard: detect the device then
>> $ loginctl attach seatNumber DevicePath
>> As for the graphic card, I am lost.
>>
>> OS: Fedora 22
>> gdm
>> 1 nvidia card
>> 1 USB3 plugable dockin station for the second monitor
>> Nvidia driver (I would like to avoid using Nouveau if possible).
>>

> Following this old blog[0], it seems I must FIRST assign the graphic
> card to seat1. So I guess first is to take care of the /etc/X11 stuff.
> Once I have correctly configured it, I must be able to see two cards,
> right ?
>

Here are the steps I took to make my multi seat with Debian Sid:

1. Install the nvidia drivers and blacklist the nouveau drivers.
2. Locate with loginctl seat-status seat0 the address of the graphic
device you want to be seat1

Maybe there is no graphic device, but I have:
      ├─/sys/devices/pci0000:00/0000:00:05.0/0000:02:00.1/sound/card2
      │ sound:card2 "NVidia"
so the the gpu is /sys/devices/pci0000:00/0000:00:05.0/0000:02:00.0
use udevadm info /sys/bus/pci/devices/0000:00:05.0/0000:02:00.0
to make sure the address is right

$ udevadm info /sys/bus/pci/devices/0000:00:05.0/0000:02:00.0
P: /devices/pci0000:00/0000:00:05.0/0000:02:00.0
E: DEVPATH=/devices/pci0000:00/0000:00:05.0/0000:02:00.0
E: DRIVER=nvidia
E: ID_AUTOSEAT=1
E: ID_MODEL_FROM_DATABASE=GF119 [GeForce GT 610]
E: ID_PCI_CLASS_FROM_DATABASE=Display controller
E: ID_PCI_INTERFACE_FROM_DATABASE=VGA controller
E: ID_PCI_SUBCLASS_FROM_DATABASE=VGA compatible controller
E: ID_SEAT=seat1
E: ID_VENDOR_FROM_DATABASE=NVIDIA Corporation
E: MODALIAS=pci:v000010DEd0000104Asv00003842sd00002615bc03sc00i00
E: PCI_CLASS=30000
E: PCI_ID=10DE:104A
E: PCI_SLOT_NAME=0000:02:00.0
E: PCI_SUBSYS_ID=3842:2615
E: SUBSYSTEM=pci
E: TAGS=:seat1:seat:master-of-seat:
E: USEC_INITIALIZED=4003578

3. Make an udev rule for the gpu:
$ 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"

4. create a x11 conf for the nvidia device
$ 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


5. reboot or trigger udev to load the rule
6. Check if the seat is created
$ loginctl list-seats
SEAT
seat0
seat1

2 seats listed.

7. use loginctl attach and connect all other devices to seat1


success,

floris