nomodeset as a kernel parameter fix the problem. But, if you use
nomodeset then you'll get software 3D acceleration in a clean
installation (it seems radeon driver breaks suspend). If you install
fglrx (binary blob) then you MUST use nomodeset to disable radeon (open
source) driver to load. Then, you'll get hardware 3D acceleration via
binary blob.

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https://bugs.launchpad.net/bugs/1283938

Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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