That one monitor loses sync is a kernel modesetting bug. Note that
apport failed to upload the dmesg so I can't check for any likely causes
of the freezes. However, if you can grab a drm.debug=6 dmesg for the
both classes of failures, I may be able to resolve them.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1161112
Title:
Raring regression: SNA fails completely; UXA causes random hangs
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