After trying numerous workarounds, the only thing that resolved this problem was reverting xserver-xorg-video-intel back to version 2.8.0-27 via ppa.
-- Xorg crash https://bugs.launchpad.net/bugs/564570 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
