https://bugs.freedesktop.org/show_bug.cgi?id=41592
--- Comment #10 from peterle@hottemptation.org 2011-10-30 13:58:51 PDT --- Bugzilla Gnome 661898 Posted some days ago.
Because it can be just a bug around the radeon driver in kernel I opened a new bug here. https://bugs.freedesktop.org/show_bug.cgi?id=41838
Would be intersting to see if it freezes your system in the same way, if you visit the website I mentioned in my bug. So we can be sure, that is the same issue.