[Bug 2146642] [NEW] No audio via HDMI with kernel 7.0 and AMDGPU

Public bug reported:

Audio via HDMI stops working after upgrading ubuntu-server from noble
(Kernel 6.17.0-19) to resolute (kernel 7.0.0-10)

aplay -L shows the right ALSA device (I use HDMI:0,0) for both noble and resolute.
I cannot get any audio via HDMI in resolute.

To reproduce: "speakertest -c2 -D hdmi:0,0" gives no noise in resolute but in noble.

I can switch back and forth between the two releases and the problem is always reproducible.
I use pure ALSA devices (Ubuntu server) and have no PipeWire or PulseAudio installed.

My graphics card is this:

08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev dc)
08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Renoir/Cezanne HDMI/DP Audio Controller

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-modules-7.0.0-10-generic 7.0.0-10.10
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: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckMismatches: ./boot/grub/i386-pc/eltorito.img
CasperMD5CheckResult: fail
Date: Sat Mar 28 18:18:36 2026
Dependencies: wireless-regdb 2026.02.04-0ubuntu1
InstallationDate: Installed on 2026-03-27 (1 days ago)
InstallationMedia: Ubuntu-Server 26.04 "Resolute Raccoon" - Daily amd64 (20260325)
MachineType: To Be Filled By O.E.M. B550M Steel Legend
ProcEnviron:
LANG=C.UTF-8
LC_CTYPE=C.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-10-generic root=UUID=95104315-6283-43c6-9156-c048f7277be2 ro amdgpu.dc=1 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/19/2022
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: P2.50
dmi.board.name: B550M Steel Legend
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:bvnAmericanMegatrendsInternational,LLC.:bvrP2.50:bd10/19/2022:br5.17:svnToBeFilledByO.E.M.:pnB550MSteelLegend:pvrToBeFilledByO.E.M.:rvnASRock:rnB550MSteelLegend:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:skuToBeFilledByO.E.M.:pfaToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: B550M Steel Legend
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: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: amd64 apport-bug resolute

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/2146642

Title:
No audio via HDMI with kernel 7.0 and AMDGPU

Status in linux package in Ubuntu:
New

Bug description:
Audio via HDMI stops working after upgrading ubuntu-server from noble
(Kernel 6.17.0-19) to resolute (kernel 7.0.0-10)

aplay -L shows the right ALSA device (I use HDMI:0,0) for both noble and resolute.
I cannot get any audio via HDMI in resolute.

To reproduce: "speakertest -c2 -D hdmi:0,0" gives no noise in resolute but in noble.

I can switch back and forth between the two releases and the problem is always reproducible.
I use pure ALSA devices (Ubuntu server) and have no PipeWire or PulseAudio installed.

My graphics card is this:

08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev dc)
08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Renoir/Cezanne HDMI/DP Audio Controller

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-modules-7.0.0-10-generic 7.0.0-10.10
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: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckMismatches: ./boot/grub/i386-pc/eltorito.img
CasperMD5CheckResult: fail
Date: Sat Mar 28 18:18:36 2026
Dependencies: wireless-regdb 2026.02.04-0ubuntu1
InstallationDate: Installed on 2026-03-27 (1 days ago)
InstallationMedia: Ubuntu-Server 26.04 "Resolute Raccoon" - Daily amd64 (20260325)
MachineType: To Be Filled By O.E.M. B550M Steel Legend
ProcEnviron:
LANG=C.UTF-8
LC_CTYPE=C.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-10-generic root=UUID=95104315-6283-43c6-9156-c048f7277be2 ro amdgpu.dc=1 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/19/2022
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: P2.50
dmi.board.name: B550M Steel Legend
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:bvnAmericanMegatrendsInternational,LLC.:bvrP2.50:bd10/19/2022:br5.17:svnToBeFilledByO.E.M.:pnB550MSteelLegend:pvrToBeFilledByO.E.M.:rvnASRock:rnB550MSteelLegend:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:skuToBeFilledByO.E.M.:pfaToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: B550M Steel Legend
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2146642/+subscriptions