https://bugs.freedesktop.org/show_bug.cgi?id=45018
--- Comment #58 from Alexandre Demers alexandre.f.demers@gmail.com 2012-06-05 19:18:10 UTC --- I noticed a different clue that could help track down the bug: when X doesn't completly freezes, there is a backtrace under .xsession-error. So I'm attaching both dmesg and the xsession snippet related to this crash.