update: Executing "xset -dpms" at startup
(System Settings -> Startup and Shutdown -> Automatically Started Applications)
solves the problem (on KUbuntu 18.04 Beta + NVIDIA-390 Drivers, didn't test the 
other mentioned ones) for me.

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https://bugs.launchpad.net/bugs/1573345

Title:
  Dual monitor loses settings after screen sleep

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