Well a few hours with gemini, chatgpt and the wiki and i have a solution, dont ask me why it works but it does.
After a fresh install (LE13) all it needs is :
Code
mkdir -p /storage/.config
echo -e '#!/bin/sh\npactl load-module module-udev-detect' > /storage/.config/autostart.sh
chmod +x /storage/.config/autostart.sh
reboot
After the reboot,there will be a PulseAudio Device like "PULSE:Built-in Audio Digital Stereo (HDMI),HDMI / Displayport (PULSEAUDIO)"
If i select that it works like a charm.
Maybe this helps someone.
Greetings
Zig.