Ok, I understand. I have gone through and checked the hardware again. I made sure every connection is valid.
I can't find anything on the os itself. I tried a bunch of stuff but nothing worked.
I did however get an "improvement" somehow. I noticed that only the first 6 LEDs turn on. But not reliably. They show seemingly random colors and turn on and off at their own will.
Rarely 1 or 2 different LEDs blink for a split second. I have to guess they are around LED 28..
I have also noticed only once on a reboot of the Pi that all LEDs kind of tried to turn on. For half a second they where all in red, green and blue at the same time but the light didnt mix to white so it looked really wierd. Maybe my eyes tricked me but that shows that they indeed do work and my hardware/software setup was at least correct once.
They only "work" with usb capture. If I disable usb capture and play any effect nothing happens...
I suspect the there is a problem with adressing the LEDs. I would like to try an older version to see if this changes anything.
I uninstalled hyperion again and tried to install it with this command:
sudo apt-get update && sudo apt-get install hyperion=2.0.13
E: Version '2.0.13' for 'hyperion' was not found
What would be the correct command to install a previous version?
Thanks for your help!