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AMP2 - No sound in Raspberry OS lite - Sound in Raspberry OS desktop

Erik

October 24, 2020 19:05

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I have the strange behaviour that with a Raspberry OS desktop I do get sound from the AMP2. But with the same OS but the Lite version I cannot get any sound comming from the AMP2.

On the Raspberry OS desktop I left everything default and only set the dtoverlay=hifiberry-dacplus in the config.txt.
On the Rasberry OS lite I do have some other software installed and UART enabled in config.txt (has to do with a lit button I want to use). But this shouldn't be of any interference. And also set the dtoverlay to the same as the desktop OS in config.txt.

What am I missing? Checked alsamixer and digital volume was set at 100, decreased it to 25, so not to blow my speakers/ears.

aplay -l shows the Hifiberry as it should.

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0

Anything missing from Raspberry OS lite that should be installed manually?

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2 comments

• 0
  
  HiFiBerry team October 25, 2020 07:30

  Raspberry Pi OS Lite should work just fine. That's the one we're using here. Maybe some of your other software did mess with some configurations.

• 0
  
  Erik October 25, 2020 08:44

  Ok, good to know it should work. Will try with completely vanilla Raspberry OS lite today.

  Update:

  Did a reinstall today and it works now.

  Strange thing is, the shutdown python script that I use seems to be the culprit. No idea why a button and a script that sends a "shutdown -h" command could cause such an issue.

   

  Update 2:

  Figured it out: Hifiberry AMP2 uses GPIO 3 for configuration. The shutdown script found relies on GPIO 3 to also use it to wake up the rpi. 
  I could still use GPIO 3 to wake it up (as it's just shorting GPIO 3 to ground) but the service that is using it to shutdown must us another pin.

  Edited by Erik October 27, 2020 18:44