This bug has been fixed in xorg-server-1.12.2.901 . The patch that fixes the bug can be found here: http://cgit.freedesktop.org/xorg/xserver/commit/?id=2d4fda4b09e67e47d3e6fc4743fc6e81bfe40f28 See also: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/953960 https://bugs.freedesktop.org/show_bug.cgi?id=48167 https://bugs.archlinux.org/task/29191