Can't change output device from Settings

[Luqman]

I upgraded my Desktop from 18.04 to 20.04.1 and noticed that in addition to the appearance changes in the Sound Settings, there was also a regression.

Steps to Reproduce:

1. Open Settings app and go to Sound section.
2. Click 'Test' button beside chosen Output Device.
3. Press the 'Front Left', 'Front Right', etc buttons and hear the corresponding output.
4. Change output device to a different device.
5. Try Step 3 again.

Expected: The test audio plays out of the newly selected device.
Actual: The test audio plays out of the previous device.

Toggling the device does not help. Nor does restarting the Settings app.

Note: This isn't just the Test Audio. Currently playing audio won't switch to the selected device, nor will any new audio started after the switch.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 12 01:40:21 2020
InstallationDate: Installed on 2018-09-01 (772 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: USB PnP Sound Device - USB PnP Sound Device
Symptom_PulseAudioLog:
 Oct 12 01:17:33 luq-home-pc dbus-daemon[945]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.30' (uid=121 pid=1281 comm="/usr/bin/pulseaudio --daemonize=no --log-target=jo" label="unconfined")
 Oct 12 01:17:33 home-pc pulseaudio[1281]: No UCM verb is valid for hw:1
 Oct 12 01:17:34 home-pc pulseaudio[1281]: No UCM verb is valid for hw:0
 Oct 12 01:17:40 home-pc systemd[1275]: pulseaudio.service: Succeeded.
 Oct 12 01:17:51 home-pc systemd[1275]: pulseaudio.socket: Succeeded.
Symptom_Type: Volume slider, or mixer problems
Title: [HDA-Intel - HDA Intel PCH, playback] volume slider problem
UpgradeStatus: Upgraded to focal on 2020-10-12 (0 days ago)
dmi.bios.date: 10/26/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F2b
dmi.board.asset.tag: Default string
dmi.board.name: Z370N WIFI-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF2b:bd10/26/2017:svnGigabyteTechnologyCo.,Ltd.:pnZ370NWIFI:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnZ370NWIFI-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Default string
dmi.product.name: Z370N WIFI
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

[Luqman (luqmana)]

Also interestingly, the little Testing window popup now lets you press multiple buttons and hear the test sounds simultaneously whereas before it was one at a time.

[Luqman (luqmana)]

Updated description and title to indicate that the selected device choice is not respected for all audio, not just the test audio.

[Luqman (luqmana)]

Looks like a duplicate of lp:1899442. After clearing my .config/pulse things seem to work as intended.

[Luqman (luqmana)]

Err, I mean lp:1866194 :P