SUMMARY
I'm unsure when this occurred, but sound was working fine under my NEON setup until recently (I suspect an upgrade broke something).

QT: 5.14.10

Graphics Platform (both Wayland and X11 have the same issue).

The sound devices still show up under the sound options
HDIM/ DisplayPort 1 Output (sof-hda-dsp HDMI / DisplayPort 1 Output)
Speaker (sof-hda-dsp Speaker + Headphones)

This is the same as when working.  Selecting either of these output devices produces absolutely nothing.

A bluetooth speaker does work.

Input devices seem to be functioning OK.

the log has  a lot of these

 22 11:17:41 peter-xps157590 plasmashell[3254]: kpipewire_logging: Window not available PipeWireSourceItem_QML_958(0x55936d49e3e0, parent=0x55936d3dfed0, geometry=0,0 270x127)
Aug 22 11:17:41 peter-xps157590 plasmashell[3254]: message repeated 21 times: [ kpipewire_logging: Window not available PipeWireSourceItem_QML_958(0x55936d49e3e0, parent=0x55936d3dfed0, geometry=0,0 270x127)]
Aug 23 10:57:14 peter-xps157590 plasmashell[2865]: kpipewire_logging: Window not available PipeWireSourceItem_QML_959(0x5642f3973d90, parent=0x5642f2db86c0, geometry=0,0 154x69)

I can find no mention of pipewire anything in systemctl.

Sound was working recently on both internal speaker on the laptop and HDMI.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.27.7
KDE Frameworks Version:  5.108.0
Qt Version: 5.14.10

ADDITIONAL INFORMATION
sudo apt list | grep pipewire

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

gstreamer1.0-pipewire/jammy-updates,now 0.3.48-1ubuntu3 amd64 [installed,automatic]
gstreamer1.0-pipewire/jammy-updates 0.3.48-1ubuntu3 i386
libkpipewire-dev/jammy 5.27.7-0xneon+22.04+jammy+release+build19 amd64
libkpipewire5-dbgsym/jammy 5.27.7-0xneon+22.04+jammy+release+build19 amd64
libkpipewire5/jammy,now 5.27.7-0xneon+22.04+jammy+release+build19 amd64 [installed,automatic]
libkpipewirerecord5-dbgsym/jammy 5.27.7-0xneon+22.04+jammy+release+build19 amd64
libkpipewirerecord5/jammy,now 5.27.7-0xneon+22.04+jammy+release+build19 amd64 [installed,automatic]
libpipewire-0.3-0/jammy-updates,now 0.3.48-1ubuntu3 amd64 [installed,automatic]
libpipewire-0.3-0/jammy-updates 0.3.48-1ubuntu3 i386
libpipewire-0.3-common/jammy-updates,jammy-updates,now 0.3.48-1ubuntu3 all [installed,automatic]
libpipewire-0.3-dev/jammy-updates 0.3.48-1ubuntu3 amd64
libpipewire-0.3-dev/jammy-updates 0.3.48-1ubuntu3 i386
libpipewire-0.3-modules/jammy-updates,now 0.3.48-1ubuntu3 amd64 [installed,automatic]
libpipewire-0.3-modules/jammy-updates 0.3.48-1ubuntu3 i386
pipewire-audio-client-libraries/jammy-updates 0.3.48-1ubuntu3 amd64
pipewire-audio-client-libraries/jammy-updates 0.3.48-1ubuntu3 i386
pipewire-bin/jammy-updates,now 0.3.48-1ubuntu3 amd64 [installed,automatic]
pipewire-bin/jammy-updates 0.3.48-1ubuntu3 i386
pipewire-doc/jammy-updates,jammy-updates 0.3.48-1ubuntu3 all
pipewire-media-session/jammy,now 0.4.1-2ubuntu1 amd64 [installed,automatic]
pipewire-pulse/jammy-updates 0.3.48-1ubuntu3 amd64
pipewire-pulse/jammy-updates 0.3.48-1ubuntu3 i386
pipewire-tests/jammy-updates 0.3.48-1ubuntu3 amd64
pipewire-tests/jammy-updates 0.3.48-1ubuntu3 i386
pipewire/jammy-updates,now 0.3.48-1ubuntu3 amd64 [installed,automatic]
pipewire/jammy-updates 0.3.48-1ubuntu3 i386
qml-module-org-kde-pipewire-dbgsym/jammy 5.27.7-0xneon+22.04+jammy+release+build19 amd64
qml-module-org-kde-pipewire/jammy,now 5.27.7-0xneon+22.04+jammy+release+build19 amd64 [installed,automatic]