[pulseaudio-discuss] [PATCH] Alsa: Correct port availability with multiple jacks

[Raymond Yau]

> > > > > The use case that this patch is made for seems such that there
shouldn't
> > > > > be any jack state conflict to worry about in the first place,
though. To
> > > > > me "dock headphone" and "built-in headphone" seem like obviously
> > > > > separate paths, so I think we should reflect that in our
configuration
> > > > > by creating a new path file.
> > > >
> > > > Ah now I remembered why i didn't do that in the end (i started with
two
> > > > different path files). It's because with the default setup on the
X220
> > > > you can't mute/disable the two paths seperately.
> > >
> > > What do you mean by "the default setup"? Is there some non-default
setup
> > > where they can be separately muted?
> >
> > By default setup i mean the setup of the card when booting a linux
> > kernel without patches or any user pin configuration. Iotw the setup
> > most people are running.
> >
> > You can make them seperately mute when e.g. reconfiguring the dock
> > headphone jack as a line-out (see the patchset i sent this weekend for
> > some fixes when that's done) or potentially by changing things around in
> > kernel. E.g. either by auto-muting one of the hp's or exposing a control
> > for it.
>
> If the hardware supports it, I think it's a kernel bug if the kernel
> doesn't expose separate mute controls for both jacks.
>

If this hda codec does not have any hardware mute,
pulseaudio should know since it check those playback switches when probing
the sound card

http://mailman.alsa-project.org/pipermail/alsa-devel/2014-October/082426.html
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