I have the same problem (Xubuntu 18.04.1, Dell E7470, Intel HD Graphics 520)
light-locker shows password box after waking up, but upon entering correct 
password screen is black.
Workaround that I use:
* Open text terminal/virtual console (CRTL+ALT+F1)
* log in
* kill light-locker ($ killall light-locker)
* go to XFCE terminal (CTRL+ALT+F7) (screen is still black)
* close/open laptop lid (normal XFCE with all previously opened apps now shows)
optional
* run light-locker again in terminal to re-enable screen locking/sleep mode ($ 
light-locker)

(repeat if issue re-appears)

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https://bugs.launchpad.net/bugs/1320989

Title:
  black screen after longer screen lock

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