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

Takashi Iwai tiwai at suse.de
Sun Apr 26 18:56:49 CEST 2009

At Sun, 26 Apr 2009 12:21:37 +0100,
Mark Brown wrote:
> On Sun, Apr 26, 2009 at 01:08:22PM +0200, Takashi Iwai wrote:
> > OTOH, "* Capture Switch" is handled as "capture" switch, which is
> > indicated as "CAPTURE" (and "L" & "R") in the above.  Also, if the
> Right; however the effect of a capture switch is pretty much equivalent
> to mute for a playback control.

Although the switch is the inverted direction of the mute.

> > The keys you mentioned above are all for playback mute controls, thus
> > irrelevant with the capture switch.  User space key to toggle the
> > capture switch.
> That doesn't quite answer Timur's question - the question was more why
> capture switches are being presented to the user as mono controls even
> when the two channels can be switched independantly.

No, they are handled actually as stereo.  That's why "L" and "R" are
shown in alsamixer.  They can be toggled independently via ";" and "'"
keys.  It's just not written in the man page.

Before complaining, patches are appreciated, of course :)


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