[alsa-devel] [PATCH 1/3] ASoC: cs4270: fix Master Capture Switch polarity

Timur Tabi timur at freescale.com
Fri Apr 24 17:45:29 CEST 2009

Daniel Mack wrote:
> The control modifies the MUTE register, hence the polarity must be
> inverted.

I have a question.  In alsamixer, the capture switch looks either like this:


                          < Master >

or like this:

                            L    R

                          < Master >

What exactly does this mean?  Which one is supposed to mean "muted"?
And how come even though this switch is a SOC_DOUBLE, I cannot control
the left and right channel independently with the < and > keys, and the
"M" key doesn't toggle it either.

Timur Tabi
Linux kernel developer at Freescale

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