I've a .xinitrc:
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#!/bin/bash #Enable DPMS xset +dpms xset dpms 300 300 300 #Disable Screen Saver xset s off ...
Running this on a rpi3/jessie with an official 7'' Screen; After 300 seconds without activity it turns off screen AND backlight.
Running the same stuff on rpi4/buster: After 300 seconds without activity it turns off screen. Backlight is still on.
What does I've to change, to automatic turn off the backlight?