The bug affects also Thinkpad R500 with ati card and Ubuntu 13.04 amd64 + awesome wm. You can reproduce it by hibernating and resuming.
switching to console (ctrl-alt-1) and back (ctrl-alt-7) fixes the problem.
With ubuntu 12.04 I used the proprietary graphics driver and never had this problem.
The bug affects also Thinkpad R500 with ati card and Ubuntu 13.04 amd64 + awesome wm.
You can reproduce it by hibernating and resuming.
switching to console (ctrl-alt-1) and back (ctrl-alt-7) fixes the problem.
With ubuntu 12.04 I used the proprietary graphics driver and never had this problem.