Re: [PATCH V1 4/4] ALSA: hda/realtek: fix mic jack detect failed on alc256

[Takashi Iwai <tiwai@suse.de>]

On Tue, 01 Jul 2025 08:48:56 +0200,
Joakim  Zhang wrote:
> 
> Thanks,
> 
> > -----Original Message-----
> > From: Takashi Iwai <tiwai@suse.de>
> > Sent: Tuesday, July 1, 2025 2:43 PM
> > To: Joakim Zhang <joakim.zhang@cixtech.com>
> > Cc: Takashi Iwai <tiwai@suse.de>; Kailang <kailang@realtek.com>;
> > perex@perex.cz; tiwai@suse.com; linux-sound@vger.kernel.org;
> > chris.chiu@canonical.com; Geans_chen <geans_chen@realsil.com.cn>
> > Subject: Re: [PATCH V1 4/4] ALSA: hda/realtek: fix mic jack detect failed on
> > alc256
> >
> > EXTERNAL EMAIL
> >
> > CAUTION: Suspicious Email from unusual domain.
> >
> > On Tue, 01 Jul 2025 08:35:05 +0200,
> > Joakim  Zhang wrote:
> > >
> > >
> > > Hello Takashi,
> > >
> > > Thanks a lot for your help.
> > >
> > > > > Hello Kailang,
> > > > >
> > > > > I'd like to insert another question through this. That would be
> > > > > appreciated if
> > > > you could have a look.
> > > > >
> > > > > After system boot, we can see the default mixer status as below:
> > > > >
> > > > > root@cix-localhost:~# amixer -c 0 contents
> > > > > numid=14,iface=CARD,name='Headphone Jack'
> > > > >   ; type=BOOLEAN,access=r-------,values=1
> > > > >   : values=on
> > > > > numid=12,iface=CARD,name='Internal Mic Phantom Jack'
> > > > >   ; type=BOOLEAN,access=r-------,values=1
> > > > >   : values=on
> > > > > numid=13,iface=CARD,name='Mic Jack'
> > > > >   ; type=BOOLEAN,access=r-------,values=1
> > > > >   : values=on
> > > > > numid=15,iface=CARD,name='Speaker Phantom Jack'
> > > > >   ; type=BOOLEAN,access=r-------,values=1
> > > > >   : values=on
> > > > > numid=11,iface=MIXER,name='Master Playback Switch'
> > > > >   ; type=BOOLEAN,access=rw------,values=1
> > > > >   : values=on
> > > > > numid=10,iface=MIXER,name='Master Playback Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=1,min=0,max=87,step=0
> > > > >   : values=60
> > > > >   | dBscale-min=-65.25dB,step=0.75dB,mute=0
> > > > > numid=2,iface=MIXER,name='Headphone Playback Switch'
> > > > >   ; type=BOOLEAN,access=rw------,values=2
> > > > >   : values=on,on
> > > > > numid=1,iface=MIXER,name='Headphone Playback Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=2,min=0,max=87,step=0
> > > > >   : values=87,87
> > > > >   | dBscale-min=-65.25dB,step=0.75dB,mute=0
> > > > > numid=9,iface=MIXER,name='Mic Boost Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
> > > > >   : values=0,0
> > > > >   | dBscale-min=0.00dB,step=10.00dB,mute=0
> > > > > numid=7,iface=MIXER,name='Capture Switch'
> > > > >   ; type=BOOLEAN,access=rw------,values=2
> > > > >   : values=on,on
> > > > > numid=6,iface=MIXER,name='Capture Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=2,min=0,max=63,step=0
> > > > >   : values=39,39
> > > > >   | dBscale-min=-17.25dB,step=0.75dB,mute=0
> > > > > numid=5,iface=MIXER,name='Auto-Mute Mode'
> > > > >   ; type=ENUMERATED,access=rw------,values=1,items=2
> > > > >   ; Item #0 'Disabled'
> > > > >   ; Item #1 'Enabled'
> > > > >   : values=1
> > > > > numid=8,iface=MIXER,name='Internal Mic Boost Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=2,min=0,max=3,step=0
> > > > >   : values=0,0
> > > > >   | dBscale-min=0.00dB,step=10.00dB,mute=0
> > > > > numid=4,iface=MIXER,name='Speaker Playback Switch'
> > > > >   ; type=BOOLEAN,access=rw------,values=2
> > > > >   : values=off,off
> > > > > numid=3,iface=MIXER,name='Speaker Playback Volume'
> > > > >   ; type=INTEGER,access=rw---R--,values=2,min=0,max=87,step=0
> > > > >   : values=0,0
> > > > >   | dBscale-min=-65.25dB,step=0.75dB,mute=0
> > > > > numid=17,iface=PCM,name='Capture Channel Map'
> > > > >   ; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
> > > > >   : values=0,0
> > > > >   | container
> > > > >     | chmap-fixed=FL,FR
> > > > > numid=16,iface=PCM,name='Playback Channel Map'
> > > > >   ; type=INTEGER,access=r----R--,values=2,min=0,max=36,step=0
> > > > >   : values=0,0
> > > > >   | container
> > > > >     | chmap-fixed=FL,FR
> > > > >
> > > > > It can auto switch 'Headphone Playback Switch'/'Headphone Playback
> > > > > Volume' and 'Speaker Playback Switch'/'Speaker Playback Volume',
> > > > > when I plugin the headset or not, but I have not found the related
> > > > > logic, could you
> > > > please help clarify a bit?
> > > >
> > > > Isn't it "Auto-Mute Mode"?  If it's set, the speaker is muted
> > > > automatically when the headphone/headset jack is plugged by the kernel
> > driver itself.
> > >
> > > What strange is 'Auto-Mute Mode' would be disabled after headset
> > plugin/out several times, don' t know the reason....
> >
> > "Auto-Mute Mode" is a software switch, and it means some program must
> > have turned it off explicitly.  e.g. the sound server like pulseaudio or pipewire
> > disables it.
> >
> > > However, it seems that speaker and headphone/headset still can auto
> > switch. Please see below mixer status.
> >
> > Usually pulseaudio/pipewire takes over and does the switching.
> 
> OK, I see, I will dig into it, could you please tell me is there any other software switches in the mixers?

Any mixer program can change...  But basically the auto-mute is a task
of the sound daemon.


Takashi