From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Henningsson <david.henningsson@canonical.com>
Subject: Re: Constant noise on HDA ALC275
Date: Mon, 08 Oct 2012 16:39:35 +0200
Message-ID: <5072E5A7.9040701@canonical.com>
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To: Takashi Iwai <tiwai@suse.de>
Cc: Julien Danjou <julien@danjou.info>, alsa-devel@alsa-project.org
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On 10/08/2012 03:11 PM, Takashi Iwai wrote:
> At Mon, 08 Oct 2012 14:57:23 +0200,
> Julien Danjou wrote:
>>
>> On Mon, Oct 08 2012, Takashi Iwai wrote:
>>
>>> It's interesting.  So, _unmuting_ the input from NID 0x1d removes the
>>> noise?  (0x80 means the channel is muted.)
>>
>> Yes, that's it.
>>
>> (I just unloaded and reloaded the module and rechecked).
>
> OK, then could you try the patch below?
>
>
> Takashi
>
> ---
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index 8568aee..42dd605 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -5988,10 +5988,22 @@ static void alc269_fixup_mic2_mute(struct hda_codec *codec,
>   	}
>   }
>
> +static void alc275_fixup_vaio_mixer(struct hda_codec *codec,
> +				    const struct alc_fixup *fix, int action)
> +{
> +	/* _UN_muting the input from NID 0x1d fixes the mysterious speaker
> +	 * noise on Sony VAIO Z
> +	 */
> +	if (action == ALC_FIXUP_ACT_INIT)
> +		snd_hda_codec_write(codec, 0x0b, 0,
> +				    AC_VERB_SET_AMP_GAIN_MUTE,
> +				    AMP_IN_UNMUTE(4));
> +}

Hmm, isn't it easier just to toggle "Beep Playback Switch"?


-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic