Bug#858222: systemd: multi-seat not working : no gdm appear in second seat when attaching graphic card

[goulou]

Package: systemd
Version: 232-19
Severity: important

For a few months now, multiseat is not available in debian stretch.
When I issue the usual "attach" command, the udev rules are properly created,
but nothing happens on the second screen.
No more success after a reboot : the second screen stays dark (it does not even
turn on).

How to reproduce (change ids if necessary to match your hardware) :
# loginctl attach seat1
/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/drm/card1
/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2
/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/drm/renderD129


# loginctl seat-status seat1
seat1
         Devices:
                  ├─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/drm/card1
                  │ [MASTER] drm:card1
├─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.0/drm/renderD129
                  │ drm:renderD129
└─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2
                    sound:card2 "NVidia_1"
├─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2/input18
                    │ input:input18 "HDA NVidia HDMI/DP,pcm=3"
├─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2/input19
                    │ input:input19 "HDA NVidia HDMI/DP,pcm=7"
├─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2/input20
                    │ input:input20 "HDA NVidia HDMI/DP,pcm=8"
└─/sys/devices/pci0000:00/0000:00:03.0/0000:04:00.1/sound/card2/input21
                      input:input21 "HDA NVidia HDMI/DP,pcm=9"



-- Package-specific info:

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-2-amd64 (SMP w/12 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.115
ii  libacl1         2.2.52-3+b1
ii  libapparmor1    2.11.0-2
ii  libaudit1       1:2.6.7-1
ii  libblkid1       2.29.1-1
ii  libc6           2.24-9
ii  libcap2         1:2.25-1
ii  libcryptsetup4  2:1.7.3-3
ii  libgcrypt20     1.7.6-1
ii  libgpg-error0   1.26-2
ii  libidn11        1.33-1
ii  libip4tc0       1.6.0+snapshot20161117-5
ii  libkmod2        23-2
ii  liblz4-1        0.0~r131-2+b1
ii  liblzma5        5.2.2-1.2+b1
ii  libmount1       2.29.1-1
ii  libpam0g        1.1.8-3.5
ii  libseccomp2     2.3.1-2.1
ii  libselinux1     2.6-3
ii  libsystemd0     232-19
ii  mount           2.29.1-1
ii  util-linux      2.29.1-1

Versions of packages systemd recommends:
ii  dbus            1.10.16-1
ii  libpam-systemd  232-19

Versions of packages systemd suggests:
ii  policykit-1        0.105-17
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
pn  dracut           <none>
ii  initramfs-tools  0.127
ii  udev             232-19

-- no debconf information