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

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Date:	Thu, 12 Jun 2008 16:01:05 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Takashi Iwai" <tiwai@...e.de>
Cc:	"Daniel J Blueman" <daniel.blueman@...il.com>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: ALC883 recording troubles...

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.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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