Seems like a dirver bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745901
https://bugzilla.redhat.com/show_bug.cgi?id=1054435 seems like there is a possible workaround: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=745901#41 -------------------------------------------------------------------------------- I can confirm removing fglrx and using the opensource ATI driver fixed the problem. I didnt have this problem in Arch Linux so maybe the bug is already fixed upstream in a newer version of fglrx or clutter.