Balena Audio Block fails on Intel NUC

Product support
1

Hey guys

I’ve tried running the same software of ours a Intel NUC. But somehow the audio block is always failing with this error: amixer: Control sysdefault:0 element write error: Operation not permitted. This confuses me specifically because the same thing works just fine on a generic x86 (GPT) image.

Is there someone that can help me find a solution to this issue?

any help is appreciated!

2

So far i was able to pinpoint the issue to one of the two commands:

amixer --card hda-intel --quiet cset numid=2 on,on  # Master Playback Switch --> turn on hardware
amixer --card hda-intel --quiet cset numid=1 87,87  # Master Playback Volume --> max volume

normal amixer commands work, simply any set commands that writes something fail. But i still don’t know exactly why. I hope somebody is able to help here since the intel nuc image is officially supported.

3

this is just for reference for any other that might had the same issue. The problem boiled down to two things:

  1. pulseaudio was not started as i didn’t had my X server volume linked in the docker compose file
  2. i had to create a custom block with the init_audio_hardware function removed, since it was trying to set something on a card that didn’t exist which lead to a infinite restart loop
1 Like
4

Hello @lukasknk thanks for sharing your solution here!