WIth DRI re-enabled in xserver-xorg-video-intel 2:2.9.1-3ubuntu5, it is possible that this issue disappears. At least we got a flood of similar reports when DRI was disabled in -3ubuntu3. Please update to -3ubuntu5 when it becomes available on a mirror near you and close this bug report if it is no longer an issue.
WIth DRI re-enabled in xserver- xorg-video- intel 2:2.9.1-3ubuntu5, it is possible that this issue disappears. At least we got a flood of similar reports when DRI was disabled in -3ubuntu3. Please update to -3ubuntu5 when it becomes available on a mirror near you and close this bug report if it is no longer an issue.