[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 at suse.de>;
> Date:  Thu, Mar 10, 2022 09:29 PM
> To:  "huangwenhui"<huangwenhuia at uniontech.com>;
> Cc:  "perex"<perex at perex.cz>; "tiwai"<tiwai at suse.com>; "jeremy.szu"
> <jeremy.szu at canonical.com>; "hui.wang"<hui.wang at canonical.com>; "wse"
> <wse at tuxedocomputers.com>; "cam"<cam at neo-zeon.de>; "kailang"
> <kailang at realtek.com>; "tanureal"<tanureal at opensource.cirrus.com>; "sami"
> <sami at loone.fi>; "alsa-devel"<alsa-devel at alsa-project.org>; "linux-kernel"
> <linux-kernel at vger.kernel.org>;
> 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 at uniontech.com>
> 
> 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
> 
>