How to turn off display on KDE Plasma
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Turning off displays via the “Turn Off Screen” (configurable via System Settings → Shortcuts → Power Management → Turn Off Screen) doesn’t work on my desktop machine with KDE Plasma. The displays go black for less than a second, and then they immediately turn back on.
The current workaround is to add a custom shortcut to run a custom command.
sleep 1; xset dpms force off