Thanks,
The relevant logs from lightdm are:
[+0.78s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.79s] DEBUG: Launching process 1221: /usr/bin/X :0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+2.17s] DEBUG: Process 1221 exited with return value 1
Which shows that the X server failed to start.
>From Xorg.0.log-0 there is a failure (not sure if this is the correct log,
>/var/log/lightdm/x-0.log would tell you for sure):
[ 16.934] (II) NOUVEAU(0): NVEnterVT is called.
[ 16.961] (EE) NOUVEAU(0): failed to set mode: Invalid argument
Fatal server error:
[ 16.961] failed to create screen resources
[ 16.961]
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 16.961] Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[ 16.961]
[ 16.961] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 16.961] (II) NOUVEAU(0): NVLeaveVT is called.
[ 16.984] ddxSigGiveUp: Closing log
[ 16.985] Server terminated with error (1). Closing log file.
So it appears nouveaux has a problem starting on boot. I'll reassign
this to the xorg team who can better diagnose this.
** Package changed: lightdm (Ubuntu) => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/946116
Title:
lightdm fails to bring up X display automatically after boot
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