From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lu Guanqun <guanqun.lu@intel.com>
Subject: Re: [PATCH V3 1/5] sound: asoc: Adding support for
 STA529 Audio Codec
Date: Fri, 15 Apr 2011 22:10:27 +0800
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To: Takashi Iwai <tiwai@suse.de>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>, Mark Brown <broonie@opensource.wolfsonmicro.com>, Rajeev Kumar <rajeev-dlh.kumar@st.com>, "lrg@slimlogic.co.uk" <lrg@slimlogic.co.uk>
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On Fri, Apr 15, 2011 at 05:27:29PM +0800, Takashi Iwai wrote:
> In alsa-mixer abstraction, the "Capture Source" enum control is split
> over multiple switches (a switch per enum item).  This was a historical
> design at the time SoundBlaster is still standard.
> 
> One of the problems with this abstraction is that it can't handle
> multiple capture-source controls.  So, many drivers use nowadays
> "Input Source" control instead.  But, in the earlier alsa-lib, this
> wasn't handled as the capture control, thus it appears as a global
> (both directional) control in alsamixer.
> 
> Now, this control is handled as a capture control in alsa-lib, so the
> appearance is corrected.
> 

Thanks for your insightful information. :)
Much appreciated!

-- 
guanqun