linux-kernel - Re: Audio crackles with 4.1-rc1

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Date:	Wed, 10 Jun 2015 13:41:35 +0300
From:	Mihai Donțu <mihai.dontu@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Jonathan McDowell <noodles@...th.li>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: Audio crackles with 4.1-rc1

On Wed, 10 Jun 2015 12:22:53 +0200 Takashi Iwai wrote:
> At Wed, 10 Jun 2015 13:17:55 +0300, Mihai Donțu wrote:
> > On Wed, 20 May 2015 07:01:12 +0200 Takashi Iwai wrote:
> > > From: Takashi Iwai <tiwai@...e.de>
> > > Subject: [PATCH] ALSA: hda - Disable widget power-saving for ALC292 & co
> > > 
> > > We've got reports that ALC3226 (a Dell variant of ALC292) gives click
> > > noises at transition from D3 to D0 when the widget power-saving is
> > > enabled.  Further debugging session showed that avoiding it isn't
> > > trivial, unfortunately, since paths are basically activated
> > > dynamically while the pins have been already enabled.
> > > 
> > > This patch disables the widget power-saving for such codecs.
> > > 
> > > Reported-by: Jonathan McDowell <noodles@...th.li>
> > > Signed-off-by: Takashi Iwai <tiwai@...e.de>
> > > ---
> > >  sound/pci/hda/patch_realtek.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> > > index 2e246fe495f6..31f8f13be907 100644
> > > --- a/sound/pci/hda/patch_realtek.c
> > > +++ b/sound/pci/hda/patch_realtek.c
> > > @@ -5623,7 +5623,8 @@ static int patch_alc269(struct hda_codec *codec)
> > >  
> > >  	spec = codec->spec;
> > >  	spec->gen.shared_mic_vref_pin = 0x18;
> > > -	codec->power_save_node = 1;
> > > +	if (codec->core.vendor_id != 0x10ec0292)
> > > +		codec->power_save_node = 1;
> > >  
> > >  	snd_hda_pick_fixup(codec, alc269_fixup_models,
> > >  		       alc269_fixup_tbl, alc269_fixups);
> > 
> > I'm on 4.1-rc7 which appears to contain this patch, however, I still
> > get the audio artifacts (crackles) when I boot my laptop (Latitude
> > E7440):
> > 
> > [    1.058839] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC3226: line_outs=1 (0x16/0x0/0x0/0x0/0x0) type:line
> > [    1.058843] snd_hda_codec_realtek hdaudioC1D0:    speaker_outs=1 (0x14/0x0/0x0/0x0/0x0)
> > [    1.058846] snd_hda_codec_realtek hdaudioC1D0:    hp_outs=1 (0x15/0x0/0x0/0x0/0x0)
> > [    1.058849] snd_hda_codec_realtek hdaudioC1D0:    mono: mono_out=0x0
> > [    1.058851] snd_hda_codec_realtek hdaudioC1D0:    inputs:
> > [    1.058855] snd_hda_codec_realtek hdaudioC1D0:      Dock Mic=0x19
> > [    1.058859] snd_hda_codec_realtek hdaudioC1D0:      Headset Mic=0x1a
> > [    1.058862] snd_hda_codec_realtek hdaudioC1D0:      Internal Mic=0x12
> > 
> > 4.0.4 was fine.
> 
> Does it happen only once at boot (i.e. at power up), or happens always
> at runtime PM?  If it's a once-off boot thing, the patch shouldn't
> have much effect.  Something else, very subtle thing, e.g. the order
> of verb execution, might cause this kind of problem.

Only at power up. I've also suspend-resumed twice and can confirm it's
OK.

There's a _very_ brief click at suspend (when the power is cut), but it
looks like a plain circuitry thing. I probably didn't notice it before
because I wasn't looking for it.

-- 
Mihai Donțu
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