Public bug reported:
Broken HDMI Audio output on 7.0.0-12-generic Kubuntu 26.04 beta
Hardware:
CPU/GPU: AMD Ryzen 5 5600G
IGPU: AMD Ryzen 5 5600G (IGPU is set as primary in BIOS, and display is
connected to motherboard)
DGPU: Nvidia RTX 3090 (Without or with Nvidia drivers had no bearing on this
issue)
Monitor: HP 524sa via HDMI (motherboard port)
Motherboard audio: Realtek ALC892
(After brute forcing all the potential issues this is what I found)
HDMI audio device does detected correctly (ELD valid, monitor_present=1)
PipeWire routes audio to correct sink (RUNNING state)
aplay with plughw shows PCM RUNNING but nothing comes out of the monitor
speakers
ALSA channel map all zeros on card2 device 3:
values=0,0,0,0,0,0,0,0 (should be FL/FR)
dmesg shows this, but I'm not sure if it's relevant or not
amdgpu: [drm] Failed to setup vendor infoframe on connector HDMI-A-2: -22
The workaround was installing the Liquorix Kernel
Broken: 7.0.0-12-generic (Kubuntu 26.04 beta)
Working: Liquorix kernel
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-12-generic 7.0.0-12.12
ProcVersionSignature: Ubuntu 7.0.0-12.12-generic 7.0.0-rc6
Uname: Linux 7.0.0-12-generic x86_64
ApportVersion: 2.33.1-0ubuntu7
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Apr 8 21:16:35 2026
InstallationDate: Installed on 2026-03-30 (9 days ago)
InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Daily amd64 (20260325)
IwDevWlp36s0Link: Not connected.
MachineType: Micro-Star International Co., Ltd. MS-7B79
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-7.0.0-12-generic
root=UUID=913a9149-adcb-4d2a-bd3f-6cedb1e8416e ro rootflags=subvol=@ quiet
splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/28/2025
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: A.M7
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X470 GAMING PLUS (MS-7B79)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 2.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 2.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrA.M7:bd08/28/2025:br5.17:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B79:pvr2.0:rvnMicro-StarInternationalCo.,Ltd.:rnX470GAMINGPLUS(MS-7B79):rvr2.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr2.0:skuTobefilledbyO.E.M.:pfaTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7B79
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 2.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2147593
Title:
HDMI audio doesn't work on kernel 7.0.0-12-generic with an AMD Ryzen 5
5600G (Cezanne iGPU). The issue doesn't happen on Liquorix kernel.
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