I can confirm Tomasz Miąsko's observation. I changed the startup stanza
in lightdm.conf to:
start on ((filesystem
and runlevel [!06]
and started dbus
and (drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1
or stopped udev-fallback-graphics))
or runlevel PREVLEVEL=S)
and lightdm starts as expected.
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https://bugs.launchpad.net/bugs/1188131
Title:
lightdm does not start on boot since change to use plymouth-ready
(precise)
Status in “lightdm” package in Ubuntu:
Confirmed
Status in “lightdm” source package in Precise:
New
Bug description:
Lightdm fails to start on boot up, resulting in a blank screen.
Lightdm can be started manually from tty1, for example, after the
machine has been booted up.
If the default browser is set to gdm, then gdm starts up on boot.
This problem first arose immediately after upgrade to 3.2.0-45-generic
(from 3.2.0-44) in Ubuntu 12.04.2 LTS
I have tried, to no avail,
1. Moving etc/X11/xorg.conf to a backup
2. uninstalling unity-greeter, lightdm, lightdm-gobject-1-0
3. deleting /etc/lightdm and /var/lib/lightdm
4. rebooting and reinstalling unity-greeter, lightdm, lightdm-gobject-1-0
5. Adding the line "sleep 2" immediately before "exec lightdm" in
/etc/init/lightdm.conf
6. Checking that /etc/X11/default-display-manager says "/usr/sbin/lightdm"
After reinstalling all the above it was necessary to change ownership of
.Xauthority from root to my userid, to
allow lightdm to accept a password. After this lightdm still works but still
does not start up on boot.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.2.3-0ubuntu2.1
ProcVersionSignature: Ubuntu 3.2.0-45.70-generic-pae 3.2.44
Uname: Linux 3.2.0-45-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: i386
Date: Thu Jun 6 11:35:30 2013
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to precise on 2012-04-29 (403 days ago)
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