I found that the involved component is actually 'plasma-pa'.  In the 'Additional option' for "Speakers" the section "Ports" is no longer present in the resulting panel.

The "Ports" section allows to select also "(unplugged)" ports, e.g. Line-Out or Headphones.

Yes, we hid this in the applet to save space, and have gotten various complaints from people with broken jacks. The feature is still there, it just moved to being exclusively visible in the KCM. Here's how you can do it: Open the Audio Volume System Tray applet > click on the "Configure" button > go to the Audio page > Set the port override over there.

(In reply to Nate Graham from comment #2)
> Yes, we hid this in the applet to save space, and have gotten various
> complaints from people with broken jacks. The feature is still there, it
> just moved to being exclusively visible in the KCM. Here's how you can do
> it: Open the Audio Volume System Tray applet > click on the "Configure"
> button > go to the Audio page > Set the port override over there.

Unfortunately I cannot find how to do that.  I can assure you that I tried to navigate the Audio system settings in the past days but couldn't find the analogue of the Port list that used to be found in the applet.

In the "Devices" tab, Playback Devices section, I can only see the present choice (e.g. "Speakers (Built-in Audio Analog Stereo)" with the possibility
of muting it and changing its volume.  Nothing more than that and in particular no "additional options" as was the case in the applet.

Maybe this is a "Fedora 32" packaging problem, dunno... or perhaps I cannot find the proper place where the Ports list has been moved.
Sorry to bother you, however this is for me an important feature that I now miss a lot (as a workaround I now reinstalled the old 5.17 'plasma-pa' fedora package

Can you attach a screenshot of it?

Created attachment 129852 [details]
screenshot with both applet and Audio Volume Settings opened

Here is a screenshot with the contents of the Audio settings panel as I get it

(In reply to Maurizio Paolini from comment #5)
> Created attachment 129852 [details]
> screenshot with both applet and Audio Volume Settings opened
> 
> Here is a screenshot with the contents of the Audio settings panel as I get
> it

Sure!  I just attached a screenshot of my entire screen with both the applet
opened and the 'audio settings' opened.

Maurizio

Aha! It's not even seeing multiple ports in the first place. This means that the issue is deeper than anything in any KDE software, and it's somewhere in PulseAudio itself, which is somehow no longer exposing multiple ports to Plasma's UI. You can check this in the 3rd-party Pulse Audio Volume Control (AKA pavucontrol) app; I bet it shows the same thing.

I believe Fedora 32 is shipping the unreleased PulseAudio 14 (as version 13.99 or something like that) so it's quite likely that this is a PulseAudio regression. I would recommend reporting the issue to either the Fedora devs at https://bugzilla.redhat.com, or to the PulseAudio devs directly, at https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/

(In reply to Nate Graham from comment #7)
> Aha! It's not even seeing multiple ports in the first place. This means that
> the issue is deeper than anything in any KDE software, and it's somewhere in
> PulseAudio itself, which is somehow no longer exposing multiple ports to
> Plasma's UI. You can check this in the 3rd-party Pulse Audio Volume Control
> (AKA pavucontrol) app; I bet it shows the same thing.

Sorry, but I must contradict you, I just tried pavucontrol (I didn't know of its existence) and it DOES show multiple ports!
I will shortly provide a screenshot of that.

Created attachment 129858 [details]
screenshot with both audio settings panel and pavucontrol panel

"spectacle" does not allow to capture the pop-down menu that appears when clicking in the "Speakers" Port entry of pavucontrol, however it lists three
entries:

  Speakers
  Headphones (unplugged)
  Line Out (unplugged)

Anyway, by using pavucontrol I actually have a workaround for my problem

All right, if pavucontrol sees the ports, they should be visible in the KCM as well. Looks like it is our bug after all.

(In reply to Nate Graham from comment #11)
> All right, if pavucontrol sees the ports, they should be visible in the KCM
> as well. Looks like it is our bug after all.

I am using plasma-pa-5.18.5-1.fc32.x86_64; the corresponding SPEC file
of the rpm package starts with:

----------------------
Name:    plasma-pa
Version: 5.18.5
Release: 1%{?dist}
Summary: Plasma applet for audio volume management using PulseAudio

License: LGPLv2+ and GPLv2+
URL:     https://cgit.kde.org/%{name}.git

%global revision %(echo %{version} | cut -d. -f3)
%if %{revision} >= 50
%global stable unstable
%else
%global stable stable
%endif
Source0: http://download.kde.org/%{stable}/plasma/%{version}/%{name}-%{version}.tar.xz
----------------------

meaning that the source package is taken from

http://download.kde.org/stable/plasma/5.18.5/plasma-pa-5.18.5.tar.xz

I do not see any patch being applied to that.  It might be that a problem exists in that particular version of plasma-pa

Any chance you could somehow upgrade Plasma-pa or all of Plasma to 5.19 (or even better, git the master version) in Fedora to see if it's better? I ask because some audio handling stuff was re-done after 5.18, so it's possible this has already been fixed.

(In reply to Nate Graham from comment #13)
> Any chance you could somehow upgrade Plasma-pa or all of Plasma to 5.19 (or
> even better, git the master version) in Fedora to see if it's better? I ask
> because some audio handling stuff was re-done after 5.18, so it's possible
> this has already been fixed.

I just tried the fedora-rawhide rpm: plasma-pa-5.19.2-1.fc33.x86_64
and it works just fine!  As expected I have the possibility to select
"Headphones (unplugged)"...

Excellent.

Well, actually there is still a problem for users of Fedora 32. Perhaps the correct course of action is to open a bug report on bugzilla.redhat.com

Yes, they could backport the changes.