[alsa-devel] [PATCH] ALSA: hda - Disable Headphone Mic boost for ALC662

[Takashi Iwai]

At Thu, 28 May 2015 09:15:46 +0200,
David Henningsson wrote:
> 
> When headphone mic boost is above zero, some 10 - 20 second delay
> might occur before the headphone mic is operational.
> Therefore disable the headphone mic boost control (recording gain is
> sufficient even without it).
> 
> (Note: this patch is not about the headset mic, it's about the less
> common mic-in only mode.)
> 
> BugLink: https://bugs.launchpad.net/bugs/1454235
> Suggested-by: Kailang Yang <kailang at realtek.com>
> Signed-off-by: David Henningsson <david.henningsson at canonical.com>
> ---
>  sound/pci/hda/patch_realtek.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index d0fa455..87605fc 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -4240,6 +4240,10 @@ static void alc_fixup_headset_mode_alc662(struct hda_codec *codec,
>  	if (action == HDA_FIXUP_ACT_PRE_PROBE) {
>  		spec->parse_flags |= HDA_PINCFG_HEADSET_MIC;
>  		spec->gen.hp_mic = 1; /* Mic-in is same pin as headphone */
> +
> +		/* Disable boost for mic-in permanently */
> +		snd_hda_codec_write(codec, 0x1b, 0, AC_VERB_SET_AMP_GAIN_MUTE, 0x7000);
> +		snd_hda_override_wcaps(codec, 0x1b, get_wcaps(codec, 0x1b) & ~AC_WCAP_IN_AMP);

Can we really hard-code NID 0x1b here...?


Takashi