[alsa-devel] Audio crackles with 4.1-rc1

[Mihai Donțu]

On Fri, 12 Jun 2015 09:00:06 +0200 Takashi Iwai wrote:
> At Fri, 12 Jun 2015 01:23:18 +0300, Mihai Donțu wrote:
> > No, 4.0.5 and all previous kernels (>= 3.12) are OK. I have attached a
> > small tarball with the two files produced by alsa-info.sh.
> 
> Both are taken in different states (one is headphone plugged and
> another unplugged?).  At best, take the snapshot in the same situation
> for comparison.
> 
> In anyway, below is another shot in dark.  The white noise is possibly
> the ill side effect of analog loopback.  But it's strange that this
> didn't happen on 4.0.x.  And, it combines another black magic that
> worked for another Dell model.  Let's see.
> 
> 
> Takashi
> 
> ---
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index 9d3e0fcb4326..cf46f6012ba4 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -4522,6 +4522,8 @@ enum {
>  	ALC288_FIXUP_DELL1_MIC_NO_PRESENCE,
>  	ALC288_FIXUP_DELL_XPS_13_GPIO6,
>  	ALC298_FIXUP_DELL1_MIC_NO_PRESENCE,
> +	ALC292_FIXUP_DELL_E74,
> +	ALC292_FIXUP_DISABLE_AAMIX,
>  };
>  
>  static const struct hda_fixup alc269_fixups[] = {
> @@ -5054,6 +5056,16 @@ static const struct hda_fixup alc269_fixups[] = {
>  		.chained = true,
>  		.chain_id = ALC269_FIXUP_HEADSET_MODE
>  	},
> +	[ALC292_FIXUP_DISABLE_AAMIX] = {
> +		.type = HDA_FIXUP_FUNC,
> +		.v.func = alc_fixup_disable_aamix,
> +	},
> +	[ALC292_FIXUP_DELL_E74] = {
> +		.type = HDA_FIXUP_FUNC,
> +		.v.func = alc_fixup_dell_xps13,
> +		.chained = true,
> +		.chain_id = ALC292_FIXUP_DISABLE_AAMIX
> +	},
>  };
>  
>  static const struct snd_pci_quirk alc269_fixup_tbl[] = {
> @@ -5066,6 +5078,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
>  	SND_PCI_QUIRK(0x1025, 0x0775, "Acer Aspire E1-572", ALC271_FIXUP_HP_GATE_MIC_JACK_E1_572),
>  	SND_PCI_QUIRK(0x1025, 0x079b, "Acer Aspire V5-573G", ALC282_FIXUP_ASPIRE_V5_PINS),
>  	SND_PCI_QUIRK(0x1028, 0x0470, "Dell M101z", ALC269_FIXUP_DELL_M101Z),
> +	SND_PCI_QUIRK(0x1028, 0x05cb, "Dell Latitude E7440", ALC292_FIXUP_DELL_E74),
>  	SND_PCI_QUIRK(0x1028, 0x05da, "Dell Vostro 5460", ALC290_FIXUP_SUBWOOFER),
>  	SND_PCI_QUIRK(0x1028, 0x05f4, "Dell", ALC269_FIXUP_DELL1_MIC_NO_PRESENCE),
>  	SND_PCI_QUIRK(0x1028, 0x05f5, "Dell", ALC269_FIXUP_DELL1_MIC_NO_PRESENCE),

Nice shot! It appears to work. :-) No clicks, no static.

I had to apply it by hand over 4.1-rc7, because the first two arrays
look different in both it and -master. Anyway, I will play with it some
more today see if anything else is broken.

Oh, and yes, the second state is without headphones on. I removed them
without thinking when the noise started. Sorry about that.

Thanks!

-- 
Mihai Donțu