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

[Takashi Iwai <tiwai@suse.de>]

On Thu, 14 Nov 2024 01:04:22 +0100,
Jarosław Janik wrote:
> 
> On 8.11.2024 15:17, Takashi Iwai wrote:
> > OTOH, a question is rather the other route -- the beep via pcspkr
> > driver -- if this beep still works while the HD-audio is runtime
> > suspended: that's the interesting point.  Could you check that?
> > You can figure out which input device corresponds what, and try to
> > trigger directly there.
> 
> Beep via pcspkr module works fine without your patch - regardless of
> current PM state of HDA device; with your patch applied - the beep is
> very quiet if HDA is suspended (same as with firmware generated beeps).
> 
> > Also, one more question is whether the beep tone persists if you mute
> > the volume on the HD-audio (e.g. set "Speaker Playback Switch" to
> > off).  The beep tone at shutdown should be gone in this state, too.
> 
> pcspkr generated beeps are immune to every mixer/switch setting except
> for "Master Mute Switch", which mutes them completely (i.e. they are not
> very quiet, they are gone). And again - this is the very same as with
> firmware beeps; that would mean that both (firmware's and pcspkr's) are
> using PIT to drive "PC Speaker".

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.


Takashi