Automatic mic-selection on Realtek and IDT/STAC codecs

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Hi,

recently I added the code for HD-audio Realtek and IDT/Sigmatel codecs
to support the automatic capture-source selection via mic jack
plugging.  This feature is enabled for machines with one external and
one internal mic, and only for auto-BIOS parser mode in the case of
Realtek codecs.

So, don't be surprised if you see neither "Capture Source" nor "Input
Source" mixer elements after updates.  Just plugging the mic jack will
switch the input source from the internal to the external mic.

If you encounter any problems regarding this change, please let me
know.


thanks,

Takashi
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