Sorry for the spam, but this just happened again. This time I was dragging a Terminal window around which was running "top" while the machine was under load (load average between 4 and 5). I didn't cross monitors so that's probably a red herring.
Everything froze, but by switching to VT 1 and back (Ctrl-Alt-F1, Ctrl-Alt-F7) I was able to regain control by relaunching unity with LIBGL_ALWAYS_SOFTWARE=1 from that window.
I am sure I didn't have this problem just a week or two ago, sorry I can't be more specific other than that I am running 13.04.
Sorry for the spam, but this just happened again. This time I was dragging a Terminal window around which was running "top" while the machine was under load (load average between 4 and 5). I didn't cross monitors so that's probably a red herring.
Everything froze, but by switching to VT 1 and back (Ctrl-Alt-F1, Ctrl-Alt-F7) I was able to regain control by relaunching unity with LIBGL_ALWAYS_ SOFTWARE= 1 from that window.
I am sure I didn't have this problem just a week or two ago, sorry I can't be more specific other than that I am running 13.04.