Same problem here on a ThinkPad X220, Ubuntu 12.04 with LTS Enablement Stack and Kernel 3.5.0-26.40~precise1
syslog shows: Mar 2 12:10:21 xyzzy kernel: [ 537.333056] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung Mar 2 12:10:21 xyzzy kernel: [ 537.333060] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state Mar 2 12:10:21 xyzzy kernel: [ 537.342329] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off I'll test with the mainline kernel later. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1135759 Title: Random freeze with RC6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1135759/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
