[pulseaudio-discuss] [PATCH] alsa-mixer: recognize Dock headphone jack

[Raymond Yau]

> > > Recognize the Dock headphone jack in the same way the normal & front
> > > headphone jacks are detected.
> >
> > Hi Sjoerd,
> >
> > The reason "Headphone" and "Front Headphone" are both in the same path,
> > is because they're often mixed, i e, the jack is called "Front
> > Headphone" but the volume control is called only "Headphone".
> >
> > I'm not sure this is also the case for "Dock Headphone". In the case it
> > isn't, "Dock Headphone" would need its own path rather than being
> > integrated with the normal headphones path.
> >
> > Could you check this?
>
> I actually started it out as its own path, only to discover i couldn't
> unmix them/mute them seperately :/.. So yes this is definitely the case
> for at least my X220T + dock. As far as i could tell from the kernel HDA
> sources it seems that all headphone outputs always tend to get setup as
> mixed (although i could well be wrong here).
>
> I'd actually would like them to not be seperately switchable (Such that
> e.g. headphones on the laptop can get priority over headphones on the
> dock) or rather, have the dock jack turn off when the laptops headphones
> are plugged. But it looks like that needs some kernel patching to add
> controls to change the HDA routing/pin setup to make that happen.
>

This look like driver bug if headphone cannot mute dock jack

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=88d5760649d9024a2a68e649909f522ab42d891c
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