Can you try installing linux-image-3.16.0-34-generic from the -proposed repo?
If that works, this is probably the same bug I had, which has already been 
patched upstream and in -proposed (but, AFAIK, still not mainlined in ubuntu, 
except for Vivid): https://bugs.freedesktop.org/show_bug.cgi?id=42960#c57
Could be related: 
https://bugs.launchpad.net/ubuntu/utopic/+source/linux/+bug/1313804 and 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1093644
Do NOT use the workaround mentioned there, just install the newer kernel image.

** Bug watch added: freedesktop.org Bugzilla #42960
   https://bugs.freedesktop.org/show_bug.cgi?id=42960

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Title:
  Ubuntu 14.04 blank screen after wakeup from sleep

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