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[Bryce Harrington <899469@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If lightdm cannot start the X server, it should make one try of a
fallback X session.

LightDM probably wants to make the failsafe command line a configuration
item, but in Ubuntu it should be set to:

  /usr/share/xdiagnose/failsafeXServer

This launches a minimal X environment using the barebones fbdev (or
vesa) video driver.

[Testcase]
$ sudo echo 'foo' >> /etc/X11/xorg.conf
$ sudo service lightdm start
$ sudo cat /var/log/lightdm/x-0.log |  grep EE
     (EE) Problem parsing the config file
     (EE) Error parsing the config file
# Notice at this point no X session is running, console just shows some random log text, and lightdm is no longer running
$ sudo /usr/share/xdiagnose/failsafeXServer
# A graphical session comes up.
# Now remove 'foo' from the end of /etc/X11/xorg.conf (or delete xorg.conf if that's the only contents)

[lightdm log]
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.0.6, UID=0 PID=2318
[+0.00s] DEBUG: Loaded 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: Adding default seat
[+0.00s] DEBUG: Starting seat
[+0.00s] DEBUG: Starting new display for automatic login as user bryce
[+0.00s] DEBUG: Starting local X display
[+0.01s] DEBUG: Using VT 7
[+0.01s] DEBUG: Activating VT 7
[+0.01s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+0.01s] DEBUG: Launching X Server
[+0.01s] DEBUG: Launching process 2322: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: Waiting for ready signal from X server :0
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.02s] DEBUG: Process 2322 exited with return value 1
[+0.02s] DEBUG: X server stopped
[+0.02s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+0.02s] DEBUG: Releasing VT 7
[+0.02s] DEBUG: Display server stopped
[+0.02s] DEBUG: Stopping display
[+0.02s] DEBUG: Display stopped
[+0.02s] DEBUG: Stopping X local seat, failed to start a display
[+0.02s] DEBUG: Stopping seat
[+0.02s] DEBUG: Seat stopped
[+0.02s] DEBUG: Stopping lightdm, required seat has stopped
[+0.02s] DEBUG: Stopping display manager
[+0.02s] DEBUG: Display manager stopped
[+0.02s] DEBUG: Stopping Light Display Manager

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  If lightdm cannot start the X server, it should make one try of a
  fallback X session.
  
  LightDM probably wants to make the failsafe command line a configuration
  item, but in Ubuntu it should be set to:
  
-   /usr/share/xdiagnose/failsafeXServer
+   /usr/share/xdiagnose/failsafeXServer
  
  This launches a minimal X environment using the barebones fbdev (or
  vesa) video driver.
  
  [Testcase]
  $ sudo echo 'foo' >> /etc/X11/xorg.conf
  $ sudo service lightdm start
  $ sudo cat /var/log/lightdm/x-0.log |  grep EE
-      (EE) Problem parsing the config file
-      (EE) Error parsing the config file
+      (EE) Problem parsing the config file
+      (EE) Error parsing the config file
  # Notice at this point no X session is running, console just shows some random log text, and lightdm is no longer running
  $ sudo /usr/share/xdiagnose/failsafeXServer
  # A graphical session comes up.
  # Now remove 'foo' from the end of /etc/X11/xorg.conf (or delete xorg.conf if that's the only contents)
+ 
+ [lightdm log]
+ [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
+ [+0.00s] DEBUG: Starting Light Display Manager 1.0.6, UID=0 PID=2318
+ [+0.00s] DEBUG: Loaded 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: Adding default seat
+ [+0.00s] DEBUG: Starting seat
+ [+0.00s] DEBUG: Starting new display for automatic login as user bryce
+ [+0.00s] DEBUG: Starting local X display
+ [+0.01s] DEBUG: Using VT 7
+ [+0.01s] DEBUG: Activating VT 7
+ [+0.01s] DEBUG: Logging to /var/log/lightdm/x-0.log
+ [+0.01s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
+ [+0.01s] DEBUG: Launching X Server
+ [+0.01s] DEBUG: Launching process 2322: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
+ [+0.01s] DEBUG: Waiting for ready signal from X server :0
+ [+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
+ [+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
+ [+0.02s] DEBUG: Process 2322 exited with return value 1
+ [+0.02s] DEBUG: X server stopped
+ [+0.02s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
+ [+0.02s] DEBUG: Releasing VT 7
+ [+0.02s] DEBUG: Display server stopped
+ [+0.02s] DEBUG: Stopping display
+ [+0.02s] DEBUG: Display stopped
+ [+0.02s] DEBUG: Stopping X local seat, failed to start a display
+ [+0.02s] DEBUG: Stopping seat
+ [+0.02s] DEBUG: Seat stopped
+ [+0.02s] DEBUG: Stopping lightdm, required seat has stopped
+ [+0.02s] DEBUG: Stopping display manager
+ [+0.02s] DEBUG: Display manager stopped
+ [+0.02s] DEBUG: Stopping Light Display Manager

-- 
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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/899469

Title:
  lightdm support for a failsafe-x mode

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  If lightdm cannot start the X server, it should make one try of a
  fallback X session.

  LightDM probably wants to make the failsafe command line a
  configuration item, but in Ubuntu it should be set to:

    /usr/share/xdiagnose/failsafeXServer

  This launches a minimal X environment using the barebones fbdev (or
  vesa) video driver.

  [Testcase]
  $ sudo echo 'foo' >> /etc/X11/xorg.conf
  $ sudo service lightdm start
  $ sudo cat /var/log/lightdm/x-0.log |  grep EE
       (EE) Problem parsing the config file
       (EE) Error parsing the config file
  # Notice at this point no X session is running, console just shows some random log text, and lightdm is no longer running
  $ sudo /usr/share/xdiagnose/failsafeXServer
  # A graphical session comes up.
  # Now remove 'foo' from the end of /etc/X11/xorg.conf (or delete xorg.conf if that's the only contents)

  [lightdm log]
  [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
  [+0.00s] DEBUG: Starting Light Display Manager 1.0.6, UID=0 PID=2318
  [+0.00s] DEBUG: Loaded 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: Adding default seat
  [+0.00s] DEBUG: Starting seat
  [+0.00s] DEBUG: Starting new display for automatic login as user bryce
  [+0.00s] DEBUG: Starting local X display
  [+0.01s] DEBUG: Using VT 7
  [+0.01s] DEBUG: Activating VT 7
  [+0.01s] DEBUG: Logging to /var/log/lightdm/x-0.log
  [+0.01s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
  [+0.01s] DEBUG: Launching X Server
  [+0.01s] DEBUG: Launching process 2322: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
  [+0.01s] DEBUG: Waiting for ready signal from X server :0
  [+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
  [+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
  [+0.02s] DEBUG: Process 2322 exited with return value 1
  [+0.02s] DEBUG: X server stopped
  [+0.02s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
  [+0.02s] DEBUG: Releasing VT 7
  [+0.02s] DEBUG: Display server stopped
  [+0.02s] DEBUG: Stopping display
  [+0.02s] DEBUG: Display stopped
  [+0.02s] DEBUG: Stopping X local seat, failed to start a display
  [+0.02s] DEBUG: Stopping seat
  [+0.02s] DEBUG: Seat stopped
  [+0.02s] DEBUG: Stopping lightdm, required seat has stopped
  [+0.02s] DEBUG: Stopping display manager
  [+0.02s] DEBUG: Display manager stopped
  [+0.02s] DEBUG: Stopping Light Display Manager

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