Comment 5 for bug 1173074

And another freeze + corruption, this time just at random during use (just firefox and gnome-terminal, nothing too special). Once again, lightdm respawned automatically (with a functional greeter) but the screen corruption remained, totally freezing after login.

Find attached the relevant excempt from kern.log. Events: at 14603 the power cord is unplugged (switch to battery power), at 16009 the desktop freezes (while trying to unhide the Unity main sidebar, which I have hidden by default), I press ctrl-alt-backspace to try to restart X (nothing happens), the screen gets corrupted while the greeter appears, I try to ctrl-alt-backspace another time, then try to login, then the screen freezes completely. Finally, I do a SysRq+REISUB to recover.