Same issue. 
Tried to use ubuntu-bug to collect my system info to post on this thread. But 
when I searched for a similar issue, this one would not come up. I had to make 
a duplicate and then mark it as such. Apologies if that's not best way to do 
things.
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1027325

I should stress that this is an intermittent bug. I haven't been able to
determine factors to consistently reproduce, but it happens to me about
every other day, with an average of about 12 wake / sleep cycles per
day.

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https://bugs.launchpad.net/bugs/1021035

Title:
  black screen after waking up the screen

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