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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: xdiagnose (Ubuntu)
Importance: Undecided
Status: Invalid
--
lightdm support for a failsafe-x mode
https://bugs.launchpad.net/bugs/899469
You received this bug notification because you are a member of Ubuntu-X, which
is subscribed to xdiagnose in Ubuntu.
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