Public bug reported:
I have an AMD Radeon RX 550 connected via HDMI to a HISENSE TV.
HDMI audio becomes severely distorted/stuttering when the display
resolution is set to 3456x1944. Voices sound accelerated and the audio
is unusable.
Changing only the display resolution to 2880x1620 immediately fixes the
problem. HDMI audio then plays perfectly.
Steps to reproduce:
1. Connect the AMD Radeon RX 550 to the HISENSE TV via HDMI.
2. Set the display resolution to 3456x1944.
3. Play audio/video (for example in Firefox).
4. HDMI audio becomes heavily distorted/stuttering.
5. Change the display resolution to 2880x1620.
6. Play the same content again.
7. HDMI audio works normally.
While the problem occurs, the kernel repeatedly logs:
amdgpu 0000:01:00.0: [drm] REG_WAIT timeout 10us * 10 tries -
program_formatter_reset_dig_resync_fifo line:646
The first occurrence I found in the journal was on 2026-08-15, and the
message was repeated many times.
Expected result:
Changing the display resolution should not corrupt HDMI audio.
Actual result:
At 3456x1944 HDMI audio is severely distorted/stuttering. At 2880x1620 it works
correctly.
Additional observation:
Direct ALSA playback to the HDMI device was able to produce clean audio during
troubleshooting.
GPU: AMD Radeon RX 550 / 550 Series
HDMI audio controller: Baffin HDMI/DP Audio
Kernel: 7.0.0-29-generic
Desktop: Ubuntu GNOME
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: plm 3235 F.... wireplumber
/dev/snd/controlC1: plm 3235 F.... wireplumber
/dev/snd/seq: plm 3215 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
CurrentDmesg: Error: command ['pkexec', 'dmesg'] failed with exit code 126:
Error executing command as another user: Request dismissed
Date: Sun Aug 16 12:45:22 2026
InstallationDate: Installed on 2026-07-01 (46 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: To be filled by O.E.M. To be filled by O.E.M.
ProcEnviron:
LANG=it_IT.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-29-generic
root=UUID=4f86ad01-8f98-483d-b843-523179141148 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
acpidump: Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py']
failed with exit code 126: Error executing command as another user: Request
dismissed
dmi.bios.date: 03/23/2015
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2201
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: CROSSHAIR V FORMULA-Z
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
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.:bvr2201:bd03/23/2015:br4.6:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnCROSSHAIRVFORMULA-Z:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:skuSKU:pfaTobefilledbyO.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: SKU
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 wayland-session
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https://bugs.launchpad.net/bugs/2163598
Title:
AMD Radeon RX 550 HDMI audio distorted at 3456x1944, works correctly
at 2880x1620
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