Thanks for your bug report. Which version of Ubuntu do you use? When the black screen appears, can you change to the console hitting ctrl-alt-f1? Can you check /var/log/gdm/:0.log and /var/log/Xorg.*.log for anything interesting?
** Changed in: gdm (Ubuntu) Importance: Untriaged => Medium Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Needs Info -- Login Screen Sometimes Doesn't Appear... https://launchpad.net/bugs/55769 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs