I have installed this on my PI:
Raspbian Buster 4.19
I have installed this using the installationguide the provide (I’m real noob at this).
The module I have tested most is MMM-PIR-Sensor (https://github.com/paviro/MMM-PIR-Sensor)
But I can see in the code that MMM-PIR-Sensor uses vcgencmd!
When i test “vcgencmd display_power = 0/1” from terminal it do not work om my hardware.
If I try “echo 0/1 > /sys/class/backlight/rpi_backlight/bl_power” it works fine but…
Every time MM updates its view, MM resets bl_power and light up the screen.
(BTW, I have testet my PIR-sensor in Python and it works as expected…)