[alsa-devel] No audio output via built-in speaker on a MacMini while headphone jack is plugged in

[Takashi Iwai]

On Mon, 14 Mar 2016 18:16:11 +0100,
moosotc at gmail.com wrote:
> 
> Takashi Iwai <tiwai at suse.de> writes:
> 
> > On Mon, 14 Mar 2016 09:11:10 +0100,
> > moosotc at gmail.com wrote:
> >> 
> >> [1 Output of alsa-info.sh <application/octet-stream (base64)>]
> >> 
> >> 
> >> `amixer set Speaker unmute' makes no difference
> >> physically unplugging the headphone jack from the socket does, i.e.
> >> `amixer set Speaker (un)mute' does the right thing.
> >
> > Could you give more details?  The description is too concise and
> > vague.
> >
> 
> I have a script to toggles sound emission by the built-in speaker:
> 
> #!/bin/sh
> amixer get Speaker | grep -q "\[on\]" && onoff="mute" || onoff="unmute"
> amixer set Speaker $onoff
> echo "$onoff"
> 
> As we speak:
> 
> `--> atoggle
> Simple mixer control 'Speaker',0
>   Capabilities: pvolume pswitch
>   Playback channels: Front Left - Front Right
>   Limits: Playback 0 - 127
>   Mono:
>   Front Left: Playback 127 [100%] [0.00dB] [on]
>   Front Right: Playback 127 [100%] [0.00dB] [on]
> unmute
> 
> This setting is ignored when (i.e. speaker is always silent) if the
> headphone jack is plugged in.
> 
> This used to work in prior kernels, I believe I've shared my bisection
> results with you in one of the earlier (personal) e-mails, if there's a
> better way to achieve the desired result (i.e. control sound emission by
> the speaker regardless of the headphone jack plug-status) I'll happily
> use that instead.

As mentioned, make sure that you disable auto-mute mode:
  amixer set "Auto-Mute Mode" "Disabled"

If you still have no speaker output even after that, give alsa-info.sh
output with non-working state, and also the alsa-info.sh output from
the working state on the earlier kernel.


Takashi