Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lightdm (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1637235
Title:
xorg crashes on lock screen
Status in lightdm package in Ubuntu:
Confirmed
Bug description:
When I return from a locked screen, I get a the crash dialog "System
program problem detected". The related file in /var/log crash shows
this in the header lines:
ProblemType: Crash
Architecture: amd64
Date: Thu Oct 27 10:33:08 2016
DistroRelease: Ubuntu 16.04
ExecutablePath: /usr/lib/xorg/Xorg
ExecutableTimestamp: 1473867446
ProcCmdline: /usr/lib/xorg/Xorg -core :1 -seat seat0 -auth
/var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
ProcCwd: /
ProcEnviron:
It appears that the xorg instance on vt8 is crashing while starting
the lock process; the crash file in /var/crash appears just after
locking the screen. I have attached the xorg log from the display that
is crashing (Xorg.1.log). There is a related output in the main
display log (Xorg.0.log):
[ 10248.316] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 10248.350] (II) NOUVEAU(G0): NVLeaveVT is called.
[ 10254.968] (II) AIGLX: Resuming AIGLX clients after VT switch
[ 10254.968] (II) intel(0): switch to mode 1920x1080@60.0 on LVDS2 using pipe
0, position (0, 0), rotation normal, reflection none
[ 10255.002] (II) NOUVEAU(G0): NVEnterVT is called.
[ 10255.340] (--) synaptics: SynPS/2 Synaptics TouchPad: touchpad found
The screen locking appears to be working. VT7 is locked with a re-
direct to VT8. I can log back in through VT8 and everything is normal,
with the exception of the initial crash and subsequent crash dialog
pop-up.
Here is some relevant system information:
Lenovo ThinkPad W520
Description:Ubuntu 16.04.1 LTS
Release:16.04
lightdm: Installed: 1.18.3-0ubuntu1
xorg: Installed: 1:7.7+13ubuntu3
xserver-xorg-video-intel: Installed: 2:2.99.917+git20160325-1ubuntu1.1
xserver-xorg-video-nouveau: Installed: 1:1.0.12-1build2
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