This may have something to do with kdeconnect 
https://community.kde.org/KDEConnect
https://forum.manjaro.org/t/kde-power-saving-not-working/12207/6

My screen switches off when Chrome browser is closed, but not when Chrome is 
open.
Other applications like file browser and editor have not effect if they are 
open or closed.

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https://bugs.launchpad.net/bugs/1474534

Title:
  Screen Energy Saving and Dim Screen do not work reliably

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