Aha. It seems that this is specific to VGA outputs. I've run into bug #600116 (filed separately to attach all the relevant information and because it's different hardware) performing the steps with a VGA connector attached, but not a DVI/DisplayPort connection.
In this case, dmesg ends up full of lines like: [ 674.521262] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung [ 674.521307] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 1520 at 52) indicating a GPU hang. Running /usr/share/apport/apport-gpu-error-intel.py while this is happening will construct an apport report containing all the relevant information - particularly: dmesg, Xorg.0.log, /sys/kernel/debug/dri/0/i915_error_state, and the output of intel_gpu_dump. -- Display error when returning from sleep after docking https://bugs.launchpad.net/bugs/531069 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
