I remembered that I had some kernel parameters set, so I turned off the
CLUTTER_VBLANK fix and experimented a bit.  I used gnome-shell to
suspend, then resume and log in repeatedly until gnome-shell locked up.

(default ubuntu kernel parameters) = bug on 7th try
radeon.audio=1   = bug on 1st try
radeon.audio=1 noautogroup   = bug on 2nd try

radeon.audio=1 radeon.dpm=1 noautogroup   = no bug yet (15 tries)


I'll keep the machine like this and update if it bugs again.

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https://bugs.launchpad.net/bugs/1442311

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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