Comment # 24 on bug 958794 from Takashi Iwai

One thing you can try is to switch to UXA instead of SNA.
Try to create a file in /etc/X11/xorg.conf.d, e.g. 50-intel.conf, containing
something like:

Section "Device"
  Identifier "intel"
  Driver "intel"
  Option "AccelMethod" "UXA"
EndSection

This is merely a workaround and not a fix, but still worth to check.