Public bug reported:
forum thread: https://discourse.ubuntu.com/t/pipewire-crackling-on-
kernels-later-than-7-0-0-27/88358
I output audio through HDMI to my receiver, via an AMD gpu (a 9070xt),
via pipewire. Since upgrading kernels past 7.0.0-27, there are crackling
noises and xruns during lots of different kinds of playback, and even
when idle. The receiver makes a small popping noise when the audio
stream is interrupted, which happens multiple times per second often
times even when no audio is playing.
Increasing pipewire’s quantum to very high numbers (like 64k, over half
a second) does not seem to fix this. It also happens when the system is
idle, not just under load; the only fix I’ve found is to keep booting
with the 7.0.0-27 kernel. Playing completely silent audio from certain
programs like audacity seems to help, but is not really a fix.
I vaguely suspect this might be an issue with amdgpu but I really can’t
tell and don’t know how best to debug it from here.
This bug report bundle was taken with 7.0.0-34, but it has been
happening since at least 7.0.0-29.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-34-generic 7.0.0-34.34
ProcVersionSignature: Ubuntu 7.0.0-34.34-generic 7.0.14
Uname: Linux 7.0.0-34-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC3D0c: widders 6428 F...m pipewire
/dev/snd/pcmC3D0p: widders 6428 F...m pipewire
/dev/snd/pcmC0D9p: widders 6428 F...m pipewire
/dev/snd/seq: widders 6428 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 28 23:40:46 2026
InstallationDate: Installed on 2018-11-14 (2876 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
IwDevWlp11s0Link: Not connected.
MachineType: ASUS System Product Name
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-7.0.0-34-generic
root=UUID=86127bef-7d71-4426-8373-82798d2c8063 ro rootflags=subvol=@ quiet
splash intel_iommu=on snd-hda-intel.snoop=0
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.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-07-01 (90 days ago)
dmi.bios.date: 12/14/2023
dmi.bios.release: 18.7
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1807
dmi.board.asset.tag: Default string
dmi.board.name: ROG STRIX X670E-E GAMING WIFI
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1807:bd12/14/2023:br18.7:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXX670E-EGAMINGWIFI:rvrRev1.xx: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: ASUS
modified.conffile..etc.default.apport:
# set this to 0 to disable apport, or to 1 to enable it
# you can temporarily override this with
# sudo service apport start force_start=1
enabled=0
mtime.conffile..etc.default.apport: 2021-06-29T02:14:01.068739
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2168825
Title:
xruns in HDMI audio after kernel 7.0.0-27
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