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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https://bugs.launchpad.net/bugs/1066410
Title:
lightdm doesn't load correctly on Ubuntu 12.10
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