How to turn the backlight off in sleep mode

The PG279QM is an excellent gaming monitor. However, there was always something that annoyed me.
When the monitor turned off and went to sleep mode, the backlight stayed on for at least 2 minutes.
In a dark room this was quite noticeable.

Monitor Backlight

The solution is to disable Input Auto Switch. This way the backlight will turn off after only ~5 seconds.

Input Auto Switch

It remains unclear why the backlight stays on while the monitor is searching for input signals (e.g. from
HDMI, DisplayPort, etc.) but at least I found a workaround since I don’t need the automatic input selection.

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