Handy tip:
You can see the call stack of (many but not all) fds unity8 has open while it's 
running. Just start unity8 under valgrind with --track-fds=yes. Then you can 
get the live list of fds with their backtraces:

    vgdb v.info open_fds

Annoyingly this doesn't show the dmabuf ones we're looking for.

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https://bugs.launchpad.net/bugs/1495871

Title:
  unity8 leaks file descriptors cause unresponsive ui but power button
  works display

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