Ok all, I've done some digging around it Lightdm is trying to start
before UDEV reports the graphics devices as being ready. Please see
#969489
By adding 'and stopped udevtrigger to lightdm.conf has fixed the issue
for me.
/etc/init/lightdm.conf:
start on ((filesystem
and runlevel [!06]
and started dbus
#Added the following line
and stopped udevtrigger
and (drm-device-added card0 PRIMARY_DEVICE_FOR_DISPLAY=1
or stopped udev-fallback-graphics))
or runlevel PREVLEVEL=S)
There is opinion that UDEV needs the full path to 'card0' but I suggest
that for those with more than one graphics card (eg. Optimus) that a
race condition could happen if your nVidia appears first. I don't know
yet if this is possible though, someone with a better understanding than
me of UDEV would have to comment on that.
Either way, I'm inclined to mark this ticket as a duplicate of #969489
as it is an older ticket with more substance. This ticket has a lot more
heat so can I suggest that you all head over to the other ticket and
mark it as affecting you?
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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1066410
Title:
lightdm doesn't load correctly on Ubuntu 12.10
Status in “lightdm” package in Ubuntu:
Confirmed
Bug description:
Ubuntu 12.10 doesn't load correctly because lightdm shows only a mouse
pointer and a blinking command-line cursor.
I don't know if this is only Ubuntu 12.10 specific bug, because a similar
error appeared on my friend's computer back in 2011 on Ubuntu 11.10. However,
switching to a command line and restarting lightdm solves the problem per
instance. Also rebooting the device solves it, but also only for the specific
boot. Another reboot ends with the same "black screen with a working mouse
pointer and a blinking cursor".
I am using Asus Zenbook ux32vd (Intel HD Graphics 4000 + not used
Nvidia GT620M - Optimus technology).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1066410/+subscriptions
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