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

[Jarosław Janik <jaroslaw.janik@xxxxxxxxx>]

On 19.11.2024 16:21, Takashi Iwai wrote:
> 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).

Both "Beep" mixer and mute switch don't affect beeps generated by ACPI
firmware (and pcspkr module for that matter)

> 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.

The volume of beeps from firmware and pcspkr is fixed, it's not changed
by any available mixer setting; the only thing that affects those beeps
is Master Mute Switch, which mutes them both on the speakers and on the
headphones.

And one more thing - both beep types are audible on the headphones even
if Headphones mixer is set minimum and Headphones Mute Switch is set to
mute (if Master is unmuted, obviously)

-- 
Regards
Jarosław Janik