I have the same problem on a fresh install of Xubuntu 15.10.

* Suspending without closing laptop lid is fine.
* Turning off lock screen on sleep makes no difference (screen is black when 
opened even without a lock screen).
* Removing light-locker makes no difference.
* Installing xscreensaver makes no difference.
* Problem persists whether I choose lock screen, turn off display or suspend on 
action for closing laptop lid.
* xrandr --auto (and switching consoles) works.

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https://bugs.launchpad.net/bugs/1431149

Title:
  XFCE 4.12 Black screen after wakeup from suspending by closing the
  laptop lid

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