Comment 40 for bug 747205

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/759258 was marked as a duplicate, so it's seemingly the same bug. I didn't plug in an external monitor though, and I didn't get a a black screen, my got a while overlay for a few seconds, then it got back to normal and apport said that a system error occurred. I hope these logs can be of help.