I am also affected. 
It seems to happen when I use the laptop screen together with  a DP connected 
external screen in a dualscreen configuration (ca once a day).

Find my log attached.

** Attachment added: "syslog"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1384342/+attachment/4292474/+files/syslog

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https://bugs.launchpad.net/bugs/1384342

Title:
  kernel messages intel_crtc_wait_for_pending_flips correlate to compiz
  hang

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