if via ssh try to start X, in dmesg see that:

[  236.672326] [drm:radeon_dp_link_train_cr] *ERROR* displayport link status 
failed
[  236.672327] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed

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https://bugs.launchpad.net/bugs/1010683

Title:
  ATI Resume from Suspend leads into black screen (VGA_Switcheroo)

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