I just experienced the above bug again, so I decided to take a video after switching to TTY1 and logging in, you can see the blinking horizontal cursor and a squashed version of the display (when holding down return) - I didn't notice this until now.
I ran the command sudo pkill x multiple times in the video - to no effect (I just realized i should have ran sudo pkill xorg - not pkill x - I'll take a better video next time and i'll get the command right :P ) and i finally ran sudo shutdown -h now to turn off the computer I also noticed that Plymouth didn't start during the boot (It usually starts pretty late into boot - but it's always done this for me, i get GRUB's background displayed during boot instead) and I saw a glitched, vertical style background briefly. I now think that this may be a Plymouth bug being as this time it didn't start when it normally would, and it was glitched out. ** Attachment added: "A video showing TTY1 when the computer is being affected by this bug" https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/980058/+attachment/3062363/+files/video-2012-04-13-23-43-38.mp4 ** Also affects: plymouth Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/980058 Title: Sometimes get a white box instead of Lightdm after boot To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/980058/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs