Audio noise when low power workaround

uConsole
1

It seems the issue is power saving mode on linux, at least for ubuntu, turn off sound card power saving. There should be similar settings for other distributions.

For Ubuntu, edit the file:

sudo nano /etc/modprobe.d/snd-usb-audio.conf

Add the following content:

options snd_usb_audio power_save=0

Save and reboot.

No noise on battery less than 15%, no noise on less than 10%.

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2

tried on raspberryOS (trixie), but it looks like snd_usb_audio is not used for audio, so not sure to what kernel mod should I add that.

3

For Trixie, you might need to try this to turn off the power saving mode for sound from kernel.

  1. Create a config file:
sudo nano /etc/modprobe.d/audio_disable_powersave.conf
  1. Add the following line
options snd_bcm2835 power_save=0

If using USB audio, use options snd_usb_audio power_save=0 instead.

  1. Save, exit, and reboot
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