https://bugzilla.kernel.org/show_bug.cgi?id=30052
--- Comment #15 from Antonov Nikolay ostinru@gmail.com 2011-05-30 12:31:57 --- Yes, I can reproduce #15851: steps: Crtl+Alt+F1, "OFF" - everything is OK Stop gdm daemon - OK Start gdm or X - Freez.
with "ON" - X restarts successfully.
backtraces are very similar... so, I think it is one bug.