[alsa-devel] [PATCH0/2] jack: Add support for SND_JACK_LINEOUT

Matthew Ranostay mranostay at embeddedalley.com
Tue Oct 21 21:42:19 CEST 2008

Mark Brown wrote:
> On Tue, Oct 21, 2008 at 11:19:52AM -0400, Matthew Ranostay wrote:
>> Mark Brown wrote:
>>> or a microphone then there's no need for it - HEADSET is only provided
>>> to make it more obvious how to implement one since people often don't
>>> think of a headset as being its components.
>> Actaully it's for the jack that has a mixer switch, in which the headphone
>> support turned off and becoming a line out. I can understand not adding this,
>> since only one codec patchset will probably use it.
> What do you mean by a "mixer switch"?  Do you just mean a software
> control that can select between line and headphone signals?
Yeah, when it's a line out it doesn't mute the other lineouts.
Is the
> hardware able to determine which kind of device is connected to the
> jack?

Yes with the AC_VERB_GET_PIN_WIDGET_CONTROL verb being read when reporting the
jack status.


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