sound hdmi 5.1 subwoofer always disabled

[Steven A. Molzen]

In System Sound Settings, I chose HDMI 5.1 audio, but there is no sound from my subwoofer in any audio application.

The System Sound Settings for HDMI 5.1 always shows a disabled subwoofer slider. When I open the test window and hit the subwoofer icon button, no sound is produced.

But if I open Pulse Audio Volume Control -> Output Devices -> (unlock icon), all show mid-volume on the slider except for subwoffer. But the subwoofer slider is enabled. So I slide it to mid-volume, and go back to System Sound Settings -> test window and hit the subwoofer icon button, I hear my subwoofer is working fine.

I also then hear the subwoofer in all audio applications.

If I were to touch the System Sound Slider for the subwoofer, it immediately stops working again.

I can fix it again in Pulse Audio Volumne Control again.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.4-0ubuntu2
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 10 19:47:38 2021
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2021-01-25 (16 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thank you for your bug report, that's known upstream

https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/936

[Sebastien Bacher (seb128)]

Since the pulseaudio control work let's assuming it's a bug in the settings