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Issue: Softlockup with udev-worker during video playback via Firefox
browsers on wayland/Xorg with AMD GPU driver

Expected: stable system, and smooth video playback

What actually happens: system freezes requiring a sysreq sequence. CU
soft lockup udev-worker message in logs. DrKonqi rate-limiting for
crashes.

Steps to reproduce: 
1. Open a Firefox browser such as Zen, LibreWolf, Floorp, or Firefox itself.  
2. Navigate to an online video playback service
3. start playing videos
4. Switch desktops or let system idle till screen lock
5. system freezes, cannot interact

Key observations
* Happens with Snap Firefox and Flatpak Zen. but NOT with Chrome based browsers.  
* Does not happen with youtube playback but with other codecs and or sources
* occurs on both wayland and xorg
"watchdog: BUG: soft lockup - CPU#0 stuck for 32s! [(udev-worker):574]" found in journalctl -b -1
* "drkonqi-coredump-launcher: ... not starting since we tried this too often recently" also in logs
* sometimes happens when moving desktops in plasma
* sometimes happens after logging back in after timeout in plasma
* has occurred across multiple Ubuntu versions
* using open-source drivers


hardware affected: AMD processor with integrated graphics on an HP 15 laptop
Vendor ID: AuthenticAMD
Model name: AMD E1-2100 APU with Radeon(TM) HD Graphics
CPU family: 22


Work arounds: 
1. Disable both "use recommended performance settings" and "use acceleration when possible" selections in Firefox Preferences. 
2. use Chrome based browsers with acceleration enabled

ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: xorg 1:7.7+23ubuntu4
ProcVersionSignature: Ubuntu 6.14.0-15.15-generic 6.14.0
Uname: Linux 6.14.0-15-generic x86_64
ApportVersion: 2.32.0-0ubuntu5.1
Architecture: amd64
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: Hyprland
Date: Sat Jun  7 23:35:23 2025
DistUpgraded: 2025-05-18 14:18:02,194 DEBUG Running PostInstallScript: '/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: plucky
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Several times a week
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Since before I upgraded
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8210] [1002:9834] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:21f7]
InstallationDate: Installed on 2024-02-08 (485 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
MachineType: Hewlett-Packard HP 15 Notebook PC
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-15-generic root=UUID=fd3c1a7c-072b-4ccf-a7fb-9b7c15923d16 ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to plucky on 2025-05-18 (20 days ago)
dmi.bios.date: 08/06/2014
dmi.bios.release: 15.34
dmi.bios.vendor: Insyde
dmi.bios.version: F.22
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 21F7
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 52.2B
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 52.43
dmi.modalias: dmi:bvnInsyde:bvrF.22:bd08/06/2014:br15.34:efr52.43:svnHewlett-Packard:pnHP15NotebookPC:pvr0976100000405F00001610180:rvnHewlett-Packard:rn21F7:rvr52.2B:cvnHewlett-Packard:ct10:cvrChassisVersion:skuF4H14LA#AKH:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV
dmi.product.name: HP 15 Notebook PC
dmi.product.sku: F4H14LA#AKH
dmi.product.version: 0976100000405F00001610180
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.124-2
version.libgl1-mesa-dri: libgl1-mesa-dri 25.0.3-1ubuntu2
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.16-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.18-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug freeze plucky ubuntu
-- 
Video playback in Firefox freezes Wayland & Xorg
https://bugs.launchpad.net/bugs/2113479
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