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 08:35:05 +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.


Takashi