If this is fixed by 2.21.14 then I can tell you what the problem was...
a bug in the xserver with missing DRI2 InvalidateNotifies.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Fix Committed
** Summary changed:
- video corruption on multi display
+ (needs 2.21.14) video corruption on multi display
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https://bugs.launchpad.net/bugs/1172450
Title:
(needs 2.21.14) video corruption on multi display
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