Hello,

I've run into the problem that pavucontrol was not showing me
the internal microphone in Input Devices tab.  To no avail.

There was a heureka point: after a tweak of "Internal Mic Boost" in
alsamixer, I was able to record myself and let it reproduce for
confirmation just fine (arecord, aplay).

Then, there was another, when I figured out that in Configuration
tab in pavucontrol, I had "Analog Stereo Output" selected.
When flipped to "Analog Stereo Duplex", everything under Input
Devices started as expected.

This may perhaps be a question on pavucontrol rather than here,
but is it possible that something had changed "Analog Stereo Duplex"
to "Analog Stereo Output" and that something wasn't me?  I mean,
information lost on upgrade of pulseaudio or something like this?

If unlikely, still, there would be this RFE from my side on
pavucontrol (let's move this bug over there, then):

Please, when Input Devices tab is empty AND there is not a duplex
mode selected in Configuration tab, show a hint on the former
that the users can help themselves going to the latter and selecting
a duplex option should they expect a microphone settings available.

$ rpm -q pavucontrol alsa-utils; uname -r
> pavucontrol-4.0-3.fc32.x86_64
> alsa-utils-1.2.2-1.fc33.x86_64
> 5.6.0-0.rc6.git2.1.fc33.x86_64

snippet from alsa-info.sh:

> !!Soundcards recognised by ALSA
> !!-----------------------------
> 
>  0 [PCH            ]: HDA-Intel - HDA Intel PCH
>                       HDA Intel PCH at 0xf2240000 irq 134
> 
> 
> !!PCI Soundcards installed in the system
> !!--------------------------------------
> 
> 00:1f.3 Audio device [0403]: Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller [8086:a170] (rev 31)
>         Subsystem: Lenovo Device [17aa:5050]