maybe these are related:
http://bugs.freedesktop.org/show_bug.cgi?id=20704
http://bugzilla.kernel.org/show_bug.cgi?id=13294
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/360319
maybe these are related:
http:// bugs.freedeskto p.org/show_ bug.cgi? id=20704
http:// bugzilla. kernel. org/show_ bug.cgi? id=13294
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/360319