https://bugzilla.kernel.org/show_bug.cgi?id=113341
--- Comment #4 from Bernd Steinhauser linux@bernd-steinhauser.de --- Today I ran into this again and got the Xorg log, but there doesn't seem to be anything interesting in it. Kernel is now 4.4.4.
When the freeze occurs, I can still ssh into the system. Applications continue to run (i.e. I had a music player running), I could even reboot the system, although that seemed to take longer because X didn't like to shutdown (was markt as DSsl+ in ps aux).