Update:  I've not hit this bug after 5 days now, and I need to restart
to apply security updates.

To recap, the fix was to add the following to /etc/rc.local  :

echo auto > /sys/class/drm/card0/device/power_profile

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

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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