Re: [PATCH 0/2] Fix beep notifications by Thinkpad's ACPI firmware

[Takashi Iwai <tiwai@xxxxxxx>]

On Fri, 15 Nov 2024 05:34:57 +0100,
Jarosław Janik wrote:
> 
> On 14.11.2024 14:42, Takashi Iwai wrote:
> > So, if the HD-audio Master volume influence on the beep output of
> > pcspkr, it means that it's flowing over HD-audio, likely there is some
> > analog-input loopback.
> > 
> > Could you give alsa-info.sh output?  (Run with --no-upload option and
> > attach the output).
> > 
> > If there is a mixer widget there, one of input pins might correspond
> > to the analog beep input -- even if the pin is marked as unused.
> 
> alsa-info.txt attached

Thanks.  So this codec chip has no analog input mixer unlike Realtek.
Hmm. 

I'm not sure whether I already asked it: did you try to turn on/off
"Beep Playback Switch" (i.e. mute/unute "Beep" mixer element)?
It should control the digital beep of HD-audio's own beep input
device, but this might be also related with the internal beep from the
Lenovo firmware (and the output of pcspkr input device).

And, judging from the fact that "Master" volume influences on the beep
sound, it also means that the sound is routed to DACs -- for Conexant
codecs, Master is a virtual control just changes both Speaker and
Headphone volumes/switches, and both Speaker and Headphone controls
are tied with the Audio Output widgets.  You can check whether the
beep tone volume from pcspkr or Thinkpad ACPI is also controlled via
Speaker and Headphone mixer volume and switch.


Takashi