I tried to reproduce the problem after a reboot.
Here is what I found:
1) No apps started: not reproducible
2) VLC play paused: not reproducible
3) SMPlayer paused: not reproducible
4) Both Chrome and Firefix played YouTube video and paused: reproducible - 
instead of black screen the latest scene froze to the screen (i.e. dash, 
windows, status bar, etc.), mouse still working, but nothing else, rebooted the 
system with Ctrl-Alt-F1 and Ctrl-Alt-Del.

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https://bugs.launchpad.net/bugs/1668062

Title:
  Black screen after waking from suspend, need to reboot to use the PC

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