An idea I raised quietly a couple of months ago was to bring together power 
management and compositor pause/resume as a single operation all done and 
coordinated by Mir itself:
    https://bugs.launchpad.net/unity-mir/+bug/1255045/comments/18
That would provide us also with the perfect opportunity to "flush" all the 
buffer streams/bundles on resume and resolve this bug.

The good news is that we already have the high-level interface:
   Display::pause()
   Display::resume()

The only problem as mentioned in the above link is that it would require
some additional coupling that does not presently exist - the Display
needs to know about Compositors.

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https://bugs.launchpad.net/bugs/1233564

Title:
  Greeter is seen animating when pressing the side button to wake up

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