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

[黄文辉]

Hi  Takashi,


Thank you for your reply.


When booting with plugged headset, the headphone will be muted.


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