gnome-control-center sound won't set hdmi 5.1

[Carl Karsten]

gnome-control-center sound

Shows
output device: hdmi-audio
configure: stereo

I change configure to 5.1
output device changes to "dummy" and the configure UI goes away.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: gnome-control-center 1:3.38.5-1ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
ApportVersion: 2.20.11-0ubuntu62
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 12 18:47:39 2021
InstallationDate: Installed on 2021-04-12 (0 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210412)
ProcEnviron:
 TERM=screen
 PATH=(custom, no 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)

[Carl Karsten (carlfk)]

this line looks relevent

18:57:44.0656 Gvc: DEBUG gvc_mixer_control_lookup_device_from_stream - Could not find a device for stream 'Built-in Audio Digital Stereo (HDMI)'

[Sebastien Bacher (seb128)]

Thank you for your bug report, could you perhaps report it also directly upstream on https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues ?