Ubuntu
lightdm package

  1. Bug #1066410
  2. Comment #44

Comment 44 for bug 1066410

Revision history for this message
Gavin Graham (gavingraham) wrote :

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?