05-09-2021, 09:40 PM
(05-09-2021, 06:53 PM)pixelherodev Wrote: I was referring to the control weirdly labelled "Headphone" - the first one on the left in alsamixer.
It goes 0,28,56,100, and in tandem with the Headphone Mixer and DAC controls seems to have the biggest effect on volume.
Thank you for pointing this out!
That's a really weird label and I would have never assumed that it had such an effect on the audio volume. It makes the built-in speakers much louder, although together with introducing a lot of audio distortion at the setting of 100. Having it at 56 seems to produce loud and reasonably good sound. Having it at zero, which seems to be the default, made the built-in speakers really quiet, to the point of being nearly unusable.
I'm not really sure where the control labels actually come from, they aren't found in the PineBook Pro DTS file? I'll dig into the source code of ALSA (alsa-utils and alsa-lib seem to be the right places) to find out; maybe we can change those labels to something more meaningful.