It happened again, attaching Xorg.0.log now. Was able to move my mouse during the incident.

On 05/14/2014 10:55 PM, bugzilla-daemon@freedesktop.org wrote:
changed bug 78710
What Removed Added
Status NEW NEEDINFO
Assignee xorg-team@lists.x.org chris@chris-wilson.co.uk
QA Contact xorg-team@lists.x.org intel-gfx-bugs@lists.freedesktop.org
Component Lib/Xfont Driver/intel

Comment # 1 on bug 78710 from 
Sounds more likely to be a GPU issue. Please attach Xorg.0.log and
/sys/class/card0/error after one of these events.
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