Description:

Xorg fail to start when xfce4 remote session is open over ssh. Work fine if local Xorg session is the first and xfce4 remote session start after.



Additional info:

* package version(s):

xorg-server 1.17.1-4;
xf86-video-intel 2.99.917-4
linux-ck-sandybridge 3.19.1-1 (same result in stock kernel)
xfwm4 4.12.2-1
gnome-shell 3.14.3-2



* config and/or log files etc.


Steps to reproduce:


After console login run startx and X not start.

/home/zeus/.local/share/xorg/Xorg.0.log:

.....
[ 3343.896] (--) controlling tty is VT number 1, auto-enabling KeepTty
[ 3343.896] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
[ 3343.896] (EE) No devices detected.
[ 3343.896] (EE)
Fatal server error:
[ 3343.896] (EE) no screens found(EE)
[ 3343.896] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 3343.896] (EE) Please also check the log file at "/home/zeus/.local/share/xorg/Xorg.0.log" for additional information.
[ 3343.896] (EE)
.....

If run Xorg as root:

......
[ 8787.078] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000
[ 8787.078] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100
[ 8787.078] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, P6300
[ 8787.078] (--) using VT number 2

[ 8787.096] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20141121
[ 8789.236] (EE) intel(0): [drm] failed to set drm interface version: Permission denied [13].
[ 8789.236] (II) intel(0): [drm] Contents of '/sys/kernel/debug/dri/0/clients':
[ 8789.236] (II) intel(0): [drm] command pid dev master a uid magic
[ 8789.236] (II) intel(0): [drm] xfwm4 1680 0 y y 1001 0
[ 8789.236] (II) intel(0): [drm] xfwm4 24061 0 n n 1003 0
[ 8789.236] (II) intel(0): [drm] systemd-logind 401 0 n y 0 0
[ 8789.236] (II) intel(0): [drm] Xorg 8799 0 n y 0 0
[ 8789.236] (EE) intel(0): Failed to claim DRM device.
[ 8789.236] (II) UnloadModule: "intel"
[ 8789.236] (EE) Screen(s) found, but none have a usable configuration.
[ 8789.236] (EE)
Fatal server error:
[ 8789.236] (EE) no screens found(EE)
[ 8789.236] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 8789.236] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 8789.236] (EE)
[ 8789.243] (EE) Server terminated with error (1). Closing log file.
..........


After Xorg start normal, /sys/kernel/debug/dri/0/clients list gnome-shell (local) before xfwm4 (remote):

cat /sys/kernel/debug/dri/0/clients

command pid dev master a uid magic
systemd-logind 415 0 y y 0 0
gnome-shell 18021 0 n y 1000 5
xfwm4 18658 0 n n 1001 0
plugin-containe 21998 0 n y 1000 9