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[Michael Neuffer <neuffer@xxxxxxxxxxx>]

lightdm log with 3 displays attached

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.13.0, UID=0 PID=4640
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/60-lightdm-gtk-greeter.conf
[+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/60-xubuntu.conf
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Registered seat module unity
[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] DEBUG: Loading properties from config section SeatDefaults
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.00s] DEBUG: Seat seat0: Creating display server of type x
[+0.00s] DEBUG: Using VT 7
[+0.00s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.00s] DEBUG: DisplayServer x-0: Logging to /var/log/lightdm/x-0.log
[+0.00s] DEBUG: DisplayServer x-0: Writing X server authority to /var/run/lightdm/root/:0
[+0.00s] DEBUG: DisplayServer x-0: Launching X Server
[+0.00s] DEBUG: Launching process 4650: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.00s] DEBUG: DisplayServer x-0: Waiting for ready signal from X server :0
[+0.00s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.00s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.00s] DEBUG: User /org/freedesktop/Accounts/User1000 added
[+2.09s] DEBUG: Got signal 10 from process 4650
[+2.09s] DEBUG: DisplayServer x-0: Got signal from X server :0
[+2.09s] DEBUG: DisplayServer x-0: Connecting to XServer :0
[+2.09s] DEBUG: Seat seat0: Display server ready, starting session authentication
[+2.09s] DEBUG: Session pid=4694: Started with service 'lightdm-greeter', username 'lightdm'
[+2.10s] DEBUG: Session pid=4694: Authentication complete with return value 0: Success
[+2.10s] DEBUG: Seat seat0: Session authenticated, running command
[+2.10s] DEBUG: Session pid=4694: Running command /usr/lib/lightdm/lightdm-greeter-session /usr/sbin/lightdm-gtk-greeter
[+2.10s] DEBUG: Creating shared data directory /var/lib/lightdm-data/lightdm
[+2.10s] DEBUG: Session pid=4694: Logging to /var/log/lightdm/x-0-greeter.log
[+2.11s] DEBUG: Activating VT 7
[+2.11s] DEBUG: Activating login1 session c3
[+2.14s] DEBUG: Session pid=4694: Greeter connected version=1.13.0 resettable=false
[+2.40s] DEBUG: Session pid=4694: Greeter closed communication channel
[+2.40s] DEBUG: Session pid=4694: Exited with return value 0
[+2.40s] DEBUG: Seat seat0: Session stopped
[+2.40s] DEBUG: Seat seat0: Stopping; failed to start a greeter
[+2.40s] DEBUG: Seat seat0: Stopping
[+2.40s] DEBUG: Seat seat0: Stopping display server
[+2.40s] DEBUG: Sending signal 15 to process 4650
[+3.61s] DEBUG: Process 4650 exited with return value 0
[+3.61s] DEBUG: DisplayServer x-0: X server stopped
[+3.61s] DEBUG: Releasing VT 7
[+3.61s] DEBUG: DisplayServer x-0: Removing X server authority /var/run/lightdm/root/:0
[+3.61s] DEBUG: Seat seat0: Display server stopped
[+3.61s] DEBUG: Seat seat0: Stopped
[+3.61s] DEBUG: Required seat has stopped
[+3.61s] DEBUG: Stopping display manager
[+3.61s] DEBUG: Display manager stopped
[+3.61s] DEBUG: Stopping daemon
[+3.61s] DEBUG: Exiting with return value 1

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https://bugs.launchpad.net/bugs/1394639

Title:
  lightdm fails to start with 3 connected displays but works 2 displays

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  lightdm fails to start with 3 connected displays but works 2 displays.

  Once lightdm has started and displays the Greeter I can connect the third display without a hitch.
  After logging in I can enable the third display

  #!/bin/sh
  xrandr --output VGA-0 --off --output DP-6 --off --output DP-5 --off --output DP-4 --mode 3200x1800 --pos 0x0 --rotate normal --output DP-3 --scale 1.5x1.5 --mode 1920x1200 --pos 3200x0 --rotate normal --output DP-2 --scale 1.5x1.5 --mode 1920x1080 --pos 6080x0 --rotate normal --output DP-1 --off --output DP-0 --off 

  When lightdm is started with all three displays connected, it will
  terminate and force the Xserver to go down as well, triggering a cycle
  of Xserver/lightdm restarts. Disconnecting the 3rd display will bring
  up lightdm immediately without a glitch.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.13.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu10
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Nov 20 14:09:40 2014
  InstallationDate: Installed on 2014-05-30 (174 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  LightdmGreeterLog:
   (lightdm-gtk-greeter:7540): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
   
   (lightdm-gtk-greeter:7540): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
   
   ** (lightdm-gtk-greeter:7540): WARNING **: Failed to load user image: Failed to open file '/home/neuffer/.face': No such file or directory
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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