Public bug reported:

Often times I am seeing this visual glitch with Unity8. It is
characterized by a noticeable screen flicker (I estimate at ~20hz). It
is most easily reproduced by doing a right-edge swipe when you are
already looking at the last application (eg, can't go back any farther),
however it can also be caused by AP tests and other random UI fiddling.

Once it starts happening, the UI becomes unresponsive. The attached
video doesn't do it great justice, because the flicker just blurs into a
dimming effect. but when you see the screen go dim in this video, what's
really happening is this crazy flickering.

** Affects: unity8 (Ubuntu)
     Importance: Critical
         Status: New

** Attachment added: "unity.mp4"
   https://bugs.launchpad.net/bugs/1240229/+attachment/3878818/+files/unity.mp4

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https://bugs.launchpad.net/bugs/1240229

Title:
  The dreaded black flicker OF DEATH!

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