alsa-mixer settings - how to setup best?

Al Johnson openmoko at
Sun Aug 31 16:16:52 CEST 2008

On Sunday 31 August 2008, Christian Adams wrote:
> moinmoin
> can someone explain what the various switches/controllers found in
> alsa-mixer are for / how they have to be set for various use-cases .. ?

There's a block diagram of the Wolfson chip with many of the ALSA control 
numbers on it at:

The same page shows suggested routing for various scenarios, though the 
gsmhandset.state supplied in the images doesn't follow this suggestion.

There's more info on the chip at:
I recommend reading its datasheet if you intend to do 

> i for now am a little bit confused by the high number of possible
> settings .. which do i really need? which can be safely masked?

That depends entirely on what you're trying to do. Have a read of the docs 
above. You may still be confused, but at least you'll be in a position to ask 
more specific questions ;-)

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