Please confirm if Ctrl+Alt+F2 resolves the issue. If not then try
Ctrl+Alt+F4 then Ctrl+Alt+F2.

The former would indicate you're just being sent to the wrong VT. The
latter would indicate that a minor display reset is required.

Please also try ssh'ing in and running this during the blank screen:

  sudo fgconsole

to find out which is current.

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https://bugs.launchpad.net/bugs/2152684

Title:
  gnome-shell blanks after screen unlock

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