i resolved it, the problem was the wrong relative path

@diemen112 @karsten13 For bullseye I needed to change the display driver to the fake kms one (dtoverlay=vc4-fkms-v3d in /boot/config.txt) to have any effect of vcgencmd.
Afterwards vcgencmd only worked from the host, but not from @karsten13’s docker container. There I ran into the same problem with my MMM-Gestures module:

[09.10.2022 17:54.49.927] [LOG] Sun Oct 09 2022 17:54:49 GMT+0200 (Central European Summer Time): exec error: Error: Command failed: vcgencmd display_power 0 vcgencmd: error while loading shared libraries: libvchiq_arm.so.0: cannot open shared object file: No such file or directory

I fixed it by mounting two more files from the host, my volume mounts now are:

volumes: - ../mounts/config:/opt/magic_mirror/config - ../mounts/modules:/opt/magic_mirror/modules - ../mounts/css:/opt/magic_mirror/css - /tmp/.X11-unix:/tmp/.X11-unix - /opt/vc:/opt/vc/:ro - /usr/bin/vcgencmd:/usr/bin/vcgencmd - /usr/lib/arm-linux-gnueabihf/libvchiq_arm.so.0:/usr/lib/arm-linux-gnueabihf/libvchiq_arm.so.0 - /usr/lib/arm-linux-gnueabihf/libvcos.so.0:/usr/lib/arm-linux-gnueabihf/libvcos.so.0 - /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket

cd into ~/magicmirror/run folder and execute docker-compose up -d --force-recreate.

@keaghoul first of all you need check the model nr. of the screen. its probably an LG screen, but i don’t know the model nr.
with that you can look on Ebay for a display controller for that particular screen.

if the PSU is still oke you kan use that one. you have to check which outlet is 12V+ continue is. and you can power the screen with that.
also you need a inverter from 12v to 5v for the Raspberry.

if you wan’t to use the the speakers u need also en simple AMP i use the TDA7297, i used a other one before but that one gives a white noise.