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

[Timur Tabi]

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
                            CAPTUR

                          < 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