Re: [PATCH] ALSA: hda/realtek - Fix headset mic problem for a HP machine with alc671

[Takashi Iwai]

On Thu, 10 Mar 2022 14:58:36 +0100,
黄文辉 wrote:
> 
> Hi  Takashi,
> 
> Thank you for your reply.
> 
> When booting with plugged headset, the headphone will be muted.

The muted state is the default behavior.  Wouldn't it be unmuted if
you adjust the corresponding mixer element?


Takashi

> 
> Thanks.
>  
> ------------------ Original ------------------
> From:  "Takashi Iwai"<tiwai@xxxxxxx>;
> Date:  Thu, Mar 10, 2022 09:29 PM
> To:  "huangwenhui"<huangwenhuia@xxxxxxxxxxxxx>;
> Cc:  "perex"<perex@xxxxxxxx>; "tiwai"<tiwai@xxxxxxxx>; "jeremy.szu"
> <jeremy.szu@xxxxxxxxxxxxx>; "hui.wang"<hui.wang@xxxxxxxxxxxxx>; "wse"
> <wse@xxxxxxxxxxxxxxxxxxx>; "cam"<cam@xxxxxxxxxxx>; "kailang"
> <kailang@xxxxxxxxxxx>; "tanureal"<tanureal@xxxxxxxxxxxxxxxxxxxxx>; "sami"
> <sami@xxxxxxxx>; "alsa-devel"<alsa-devel@xxxxxxxxxxxxxxxx>; "linux-kernel"
> <linux-kernel@xxxxxxxxxxxxxxx>;
> Subject:  Re: [PATCH] ALSA: hda/realtek - Fix headset mic problem for a HP
> machine with alc671
>  
> On Thu, 10 Mar 2022 14:03:01 +0100,
> huangwenhui wrote:
> >
> > On a HP 288 Pro G8, the front Mic could not be detected.
> >
> > Signed-off-by: huangwenhui <huangwenhuia@xxxxxxxxxxxxx>
> 
> Thanks for the patch.  Most of the changes look OK, but one thing I
> still don't get:
> 
> > + case HDA_FIXUP_ACT_INIT:
> > + alc_write_coef_idx(codec, 0x19, 0xa054);
> > + msleep(80);
> > + snd_hda_codec_write(codec, hp_pin, 0,
> > +     AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_UNMUTE);
> 
> Why this unconditional unmute is required for fixing the mic problem?
> 
> Takashi
> 
>