Sounds switches from HDMI output to headset when screen blanks

[Jean-Baptiste Lallement]

On Groovy with all updates applied.

Sound on HDMI output with speakers connected to the analog output of the monitor
I've a USB sound card (Unitek Y-247A) connected to a HUB because the analog output on the machine doesn't work on which I connected the input and output jacks of a headset.

If sound is playing through the speaker, when the display blanks after a period of inactivity, the sound switches to the sound card. I expect to either continue playing on the speaker or just go silent (which I would understand since the monitor goes in sleep mode)

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: pulseaudio 1:13.99.1-1ubuntu10
ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
Uname: Linux 5.8.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: j-lallement 1348067 F.... pulseaudio
 /dev/snd/controlC1: j-lallement 1348067 F.... pulseaudio
 /dev/snd/controlC0: j-lallement 1348067 F.... pulseaudio
 /dev/snd/pcmC0D3p: j-lallement 1348067 F...m pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
Date: Fri Sep 18 09:47:09 2020
InstallationDate: Installed on 2020-05-31 (110 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200527)
RebootRequiredPkgs: evolution-data-server
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2019
dmi.bios.release: 5.16
dmi.bios.vendor: Intel Corp.
dmi.bios.version: FNCML357.0032.2019.1021.1624
dmi.board.asset.tag: Default string
dmi.board.name: NUC10i7FNB
dmi.board.vendor: Intel Corporation
dmi.board.version: K61360-302
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 35
dmi.chassis.vendor: Intel Corporation
dmi.chassis.version: 2.0
dmi.ec.firmware.release: 3.4
dmi.modalias: dmi:bvnIntelCorp.:bvrFNCML357.0032.2019.1021.1624:bd10/21/2019:br5.16:efr3.4:svnIntel(R)ClientSystems:pnNUC10i7FNH:pvrK61081-302:rvnIntelCorporation:rnNUC10i7FNB:rvrK61360-302:cvnIntelCorporation:ct35:cvr2.0:
dmi.product.family: FN
dmi.product.name: NUC10i7FNH
dmi.product.sku: BXNUC10i7FNH
dmi.product.version: K61081-302
dmi.sys.vendor: Intel(R) Client Systems

[Daniel van Vugt (vanvugt)]

Duplicate of bug 1895665. But maybe also see bug 1888598.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.