linux-kernel - Re: ALC883 recording troubles...

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Date:	Thu, 12 Jun 2008 16:13:50 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	"Vegard Nossum" <vegard.nossum@...il.com>
Cc:	"Daniel J Blueman" <daniel.blueman@...il.com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: ALC883 recording troubles...

At Thu, 12 Jun 2008 16:01:05 +0200,
Vegard Nossum wrote:
> 
> On Thu, Jun 12, 2008 at 3:55 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> > On Thu, Jun 12, 2008 at 3:52 PM, Takashi Iwai <tiwai@...e.de> wrote:
> >> At Thu, 12 Jun 2008 15:48:32 +0200,
> >> Vegard Nossum wrote:
> >>>
> >>> The external mic:
> >>>
> >>> Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
> >>>   Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x4f, mute=0
> >>>   Amp-In vals:  [0x00 0x00]
> >>
> >> The input volume is zero.  Try to raise "Mic Boost" (if present)?
> >
> > They're already all up.
> >
> > Line In Boost = 100
> > Mic Boost = 100
> > Internal Mic Boost = 100
> >
> > Right after changing all these to max, I've read the value from
> > card0/codec#0 again:
> >
> > Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
> >  Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x4f, mute=0
> >  Amp-In vals:  [0x00 0x00]
> >
> > There doesn't seem to be any difference. Even when changing them all
> > to 0 in alsamixer, this output stays the same.
> 
> Sorry, I just discovered yet another "Mic Boost" control in the
> playback section in alsamixer (the others were in the capture
> section). Changing this now gives me:
> 
> Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
>   Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x4f, mute=0
>   Amp-In vals:  [0x02 0x02]
> 
> Strange.

It's a known bug of alsa-lib mixer abstraction layer.
Some controls appear on both playback and capture views although only
the value is changed only on playback mode.

So, don't worry, it's not your fault ;)


Takashi
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