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

[Mark Brown]

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?  Is the
hardware able to determine which kind of device is connected to the
jack?