[alsa-devel] Audio crackles with 4.1-rc1

[Takashi Iwai]

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 at suse.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 at earth.li>
> > Signed-off-by: Takashi Iwai <tiwai at suse.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.


Takashi