no sound devices listed after upgrade to 24.04.1

[Stewart Greenhill]

After upgrading to 24.04.1 there are no sound devices in the desktop sound settings. Please see attached image of Settings -> Sound control panel.
Volume control is not possible via the GUI or keyboard volume controls.
Prior to the upgrade this was working perfectly in ubuntu 22.04.

Note that sound drivers are still working in other applications.
For example, sound is played correctly from Google Chrome.

ALSA correctly lists the available devices.

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC3246 Analog [ALC3246 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Suspect that this is related to changes in pulse_audio / pipewire.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: alsa-base 1.0.25+dfsg-0ubuntu7
ProcVersionSignature: Ubuntu 6.8.0-41.41-generic 6.8.12
Uname: Linux 6.8.0-41-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/seq: stewart 1738 F.... pipewire
 /dev/snd/controlC0: stewart 1740 F.... wireplumber
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 5 23:16:24 2024
InstallationDate: Installed on 2021-11-22 (1018 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
MachineType: Dell Inc. Latitude 7280
PackageArchitecture: all
ProcEnviron:
 LANG=en_AU.UTF-8
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
SourcePackage: alsa-driver
Symptom: audio
UpgradeStatus: Upgraded to noble on 2024-09-02 (3 days ago)
dmi.bios.date: 04/01/2024
dmi.bios.release: 1.37
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.37.0
dmi.board.name: 0KK5D1
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.37.0:bd04/01/2024:br1.37:svnDellInc.:pnLatitude7280:pvr:rvnDellInc.:rn0KK5D1:rvrA00:cvnDellInc.:ct10:cvr:sku079F:
dmi.product.family: Latitude
dmi.product.name: Latitude 7280
dmi.product.sku: 079F
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.init.d.apport: 2024-07-22T22:59:07