Public bug reported:
At boot, the Line Out Green Rear is replaced by Digital Output (SP/DIF)
Issuing the command,
systemctl --user restart pulseaudio
restores Line Out, which then works correctly.
There have been some instances when the issue returns after running an
audio program such as Reaper (DAW) or Audacity.
I obtained the work-around from Kubuntu Forums where there are several
similar reports from users of Kubuntu 20.10..
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.8.0-41.46-lowlatency 5.8.18
Uname: Linux 5.8.0-41-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu50.3
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat Jan 30 09:57:09 2021
InstallationDate: Installed on 2020-06-13 (230 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:Generic_1 failed
Symptom_Card: Family 17h (Models 10h-1fh) HD Audio Controller - HD-Audio Generic
Symptom_Jack: Blue Line In, Rear
Symptom_Type: No sound at all
Title: [To Be Filled By O.E.M., Realtek ALC1220, Blue Line In, Rear] No sound
at all
UpgradeStatus: Upgraded to groovy on 2021-01-26 (3 days ago)
dmi.bios.date: 11/18/2019
dmi.bios.release: 5.14
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.70
dmi.board.name: B450 Gaming-ITX/ac
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrP3.70:bd11/18/2019:br5.14:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Gaming-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug groovy
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https://bugs.launchpad.net/bugs/1913868
Title:
Green Line Out Rear displaced by Digital Output S/PDIF
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