Things I've tested which haven't made a difference:
* Copy /usr/share/doc/xserver-xorg-video-intel/xorg.conf to
* Running with the drm-intel-next kernel
Also verified that xenial still doesn't exhibit any issues by booting a
live image, so it isn't an hw issue.
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[Dell XPS 13 9343] Sceen periodically scrambles then returns to normal
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