[alsa-devel] ALSA - No sound on MBA2,1

[Takashi Iwai]

At Wed, 4 Dec 2013 15:08:40 +0100,
Bruno Prémont wrote:
> 
> On Wed, 04 Dec 2013 13:59:19 +0100 Takashi Iwai wrote:
> > At Wed, 4 Dec 2013 13:42:09 +0100, Bruno Prémont wrote:
> > > A rather borderline question/observation:
> > > When plugging in headphone and the jack is configured as headphone
> > > built-in speaker gets muted (seems reasonable default, hardware
> > > triggered).
> > > Is it possible to have that auto-muting reported in mixer and possibly
> > > overridden via mixer if wanted (possibly via
> > > mute-speaker-if-headphone-plugged option)?
> > 
> > You can turn off the auto-mute behavior via "Auto-Mute Mode" mixer
> > enum.  The Headphone and Speaker volume/mute can be still controlled
> > manually.  And the jack status can be delivered/read via "Headphone
> > Jack" control.
> 
> Oh, I mis-understood the "Auto-Mute Mode" mixer enum as idle-related
> thing. Trying it out, it works :)
> 
> 
> I've not found the "Headphone Jack" control status within alsamixer
> though I found it using amixer.

It's not in MIXER iface space, so it's not visible in alsamixer.
It's shown in alsactl or amixer control (no simple control) stuff.

> If alsamixer does not provide the information it would be a nice
> feature to add reporting state of such controls.
> If the information is already available I have not found it.

It's not documented enough, maybe, as usual :)
As a demo, just run:
	% amixer events

and try to plug/unplug.


Takashi