[alsa-devel] Audio crackles with 4.1-rc1

[Mihai Donțu]

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.

-- 
Mihai Donțu