With linux 3.8, I experienced a SNB GPU lockup an hour into a gnome-3 session. If interested, I've put the captured state at: http://quora.org/i915_error_state and http://quora.org/Xorg.0.log xserver-xorg-core is 1.13.0-0ubuntu6.1 and xserver-xorg-video-intel is 2.20.9-0ubuntu2. Thanks, Daniel -- Daniel J Blueman