linux-kernel - Re: [PATCH 0/6] sound/pci/hda: CX20549 cleanup/fixes

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Date:	Sat, 07 Apr 2012 12:34:40 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
Cc:	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] sound/pci/hda: CX20549 cleanup/fixes

At Fri, 06 Apr 2012 15:01:47 +0200,
Michael Karcher wrote:
> 
> On Thu, 2012-04-05 at 16:28 +0200, Takashi Iwai wrote:
> > BTW, did you try model=auto option to enable the auto-parser?
> > If it doesn't work well for you, let me know.
> 
> I tried the model=auto option, too. It works mostly, but the mixer node
> seems to not be utilized correctly/at all. The capture source list does
> not contain "mixer" anymore, and there are no playback controls for
> Internal Mic/Mic/Line.

Right, the analog loopback is dropped in the auto-parser for
simplicity.

> The Capture setup seems to be built correctly
> (except for the missing mixer). The auto setup adds two extra input
> devices for jack sense.
> 
> > In anyway, give alsa-info.sh output (run with --no-upload option) for
> > better checks.
> 
> alsa-info for the revised patch-set (mailed soon) with and without
> model=auto is attached. Information I consider irrelevant (non-sound
> modules and dmesg context not relating to sound) has been edited out.

Thanks.

> BTW: I seem to have encountered an ALSA user-space bug: The codec
> provides a "master capture switch", i.e. the "mute" of the adc in amp.
> It also provides a "capture source selection enum", i.e. the "Connection
> Select" of the adc widget. The enum provides mutually exclusive capture
> sources that have no volume control, whilst the master capture switch is
> coupled with the capture volume control, and should not be related to
> the source enumeration. But if I play around with capture sources in
> alsamixer, the "Capture Switch" is turned off as soon as I switch the
> source from the first item in the Mux list to something else.

This sounds like a bug in alsa-lib mixer abstraction.
There is a known shortcomings in the "capture source" enum, e.g. it
can't take more than one ADCs.

> This happens with both the patched hard-coded "BenQ" configuration and
> the auto configuration.

OK, I'll check it in the next week.


thanks,

Takashi
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