Full backtrace available on duped bug #776749
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/776749/+attachment/2110611/+files/calibre_X.stacktrace
Full backtrace available on duped bug #776749
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/776749/ +attachment/ 2110611/ +files/ calibre_ X.stacktrace