https://bugs.freedesktop.org/show_bug.cgi?id=67800
--- Comment #9 from Kertesz Laszlo laszlo.kertesz@gmail.com --- I may have found a crude workaround for the freezing issue. It seems that if i completely disable screensaver (it was turning the monitor off with dpms after 4 minutes) and leave the monitor on permanently works. I now have 1 day uptime.