Public bug reported:
I can confirm the issue on Kubuntu.
Hardware:
AMD Raven/Raven2 HDMI Audio Controller
LG Ultrawide monitor (HDMI)
HDMI audio is detected but produces no sound.
Analog headphone output works normally.
The same problem also occurs in Kubuntu Live session.
Audio works correctly in Windows 11 (dual boot).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: alsa-base 1.0.25+dfsg-0ubuntu9
ProcVersionSignature: Ubuntu 7.0.0-10.10-generic 7.0.0-rc4
Uname: Linux 7.0.0-10-generic x86_64
ApportVersion: 2.33.1-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: julio 1777 F.... wireplumber
/dev/snd/controlC0: julio 1777 F.... wireplumber
/dev/snd/seq: julio 1772 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Mar 29 15:07:49 2026
InstallationDate: Installed on 2026-03-16 (13 days ago)
InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
MachineType: System manufacturer System Product Name
PackageArchitecture: all
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: alsa-driver
UpgradeStatus: Upgraded to resolute on 2026-03-29 (0 days ago)
dmi.bios.date: 04/28/2022
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 6042
dmi.board.asset.tag: Default string
dmi.board.name: PRIME B350-PLUS
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr6042:bd04/28/2022:br5.17:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB350-PLUS:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2146736
Title:
HDMI audio not working on AMD Raven/Raven2 HDMI controller in Kubuntu
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