Please look at to bug 465317 (https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/465317) for more complete dumps on same problem. This bug is probably a duplicate of that one.
Please look at to bug 465317 (https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/465317) for more complete dumps on same problem. This bug is probably a duplicate of that one.