I don't know if it's related, but I have a similar issue.

I configured, using xfce4-power-manager-settings, the following:
- On AC: lock screen when lid is closed
- On battery: suspend.
- Lock screen when going for suspend.

What's going on:
- On AC: I close the lid, it locks screen and suspends - which is unexpected 
behavior, as I configured to lock screen when lid is closed using AC. After I 
come back from suspend, lock screen appears. I type my password and I get the 
black screen. Ctrl+Alt+F1 for terminal, sudo reboot.
- On battery: same, except for the fact that it's expected to suspend. But the 
issue of the black screen continues.

Thanks.

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https://bugs.launchpad.net/bugs/1303736

Title:
  [SRU] Black screen after wakeup from suspending by closing the laptop
  lid

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