https://bugs.freedesktop.org/show_bug.cgi?id=35697
--- Comment #20 from Christophe Saout christophe@saout.de 2011-03-29 23:43:09 PDT --- Applied that patch to my kernel yesterday and just experienced the issue again. Killed compiz, X went on, but GL is unusable. If I run e.g. glxgears, the application doesn't draw anything, but is still running and seems to be waiting for something from the X server. Closing the window results in some error "34" IIRC (I can write down the exact error next time if it helps).