linux-kernel - Re: [Bisected regression] Microphone no longer works on Toshiba Satellite A100

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Date:	Mon, 25 May 2009 18:40:42 -0400
From:	"M. Vefa Bicakci" <bicave@...eronline.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [Bisected regression] Microphone no longer works on Toshiba
 Satellite A100

Takashi Iwai wrote:
>>> [snip]
> Thanks.  Does the patch below work?

Yes, I just tried it by compiling alsa-driver-1.0.20 after applying
the patch you provided, and I can happily say that it works beautifully.

Thank you so much! I really hope that this patch will be included in
the next ALSA release and the next -rc release for 2.6.30.

> 
> (snip)
>> When one first boots this laptop, alsamixer does not show PCM playback and
>> Digital Input capture channels. However, if I run a ALSA-compatible program
>> which uses the PCM playback (such as mpg321) or the Digital Input capture
>> channel (such as arecord), then the respective channels appear in alsamixer.
>> Does this mean that a new "model=..." quirk needs to be written for this
>> this laptop? ("model=toshiba" does not work properly.)
> 
> The PCM and Digital Capture Volume are implemented in alsa-lib softvol
> plugin and is irrelevant with the driver model.  They appear either
> when you first use PCM via alsa-lib with that configuration, or when
> you restore the previous volume setting via alsactl.
> 
> Usually distro udev or init script restores the previous volume via
> alsactl, so this will appear after the very first use after the
> installation...

That clears up a lot of things. I am sorry if this was already documented
in the ALSA documentation/wiki and I missed it.

> thanks,
> 
> Takashi

Thank you once again,

M. Vefa Bicakci


> ---
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index bcbb736..0fd258e 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -776,6 +776,12 @@ static void alc_set_input_pin(struct hda_codec *codec, hda_nid_t nid,
>  		pincap = (pincap & AC_PINCAP_VREF) >> AC_PINCAP_VREF_SHIFT;
>  		if (pincap & AC_PINCAP_VREF_80)
>  			val = PIN_VREF80;
> +		else if (pincap & AC_PINCAP_VREF_50)
> +			val = PIN_VREF50;
> +		else if (pincap & AC_PINCAP_VREF_100)
> +			val = PIN_VREF100;
> +		else if (pincap & AC_PINCAP_VREF_GRD)
> +			val = PIN_VREFGRD;
>  	}
>  	snd_hda_codec_write(codec, nid, 0, AC_VERB_SET_PIN_WIDGET_CONTROL, val);
>  }
> 
> 
> 
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