[alsa-devel] Constant noise on HDA ALC275

[Takashi Iwai]

At Mon, 08 Oct 2012 16:39:35 +0200,
David Henningsson wrote:
> 
> 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"?

Good point.  I'm actually not sure whether the 0x1d is supposed to be
beep on ALC275 as well.  It's been so for ALC269, but ALC275 might be
different.


Takashi