Bisected mesa. This is a mesa bug caused by http://cgit.freedesktop.org/mesa/mesa/commit/?id=6532eb17baff6e61b427f29e076883f8941ae664 Can anybody move this to the right place or do I have to re-create the report (and if so: Where) ? I also think this is a duplication of https://bugs.freedesktop.org/show_bug.cgi?id=58667 - The crashes just occur way more often (right after starting compiz) with the locked BIOS.