> But building a new kernel and switching to it without deeper
experience and a fallback would be too hard for me.

No need to build a new kernel.  There are binaries in the link that was
posted above. You can grab some of those to try.  Just note that you
need to turn off secure boot if you have it enabled because they're not
signed.

This is an important debugging step as it helps to identify if it's
already fixed in a newer kernel and it's a backport effort for a fix or
if it's still an upstream issue.  If it's still an upstream issue it
should be reported to the developers of the driver.

> pci bus timeout, check dma status

Maybe it's an issue with the DMA implementation of the wireless driver.
You can experiment with the IOMMMU disabled (amd_iommu=off) to see if
that changes anything.

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https://bugs.launchpad.net/bugs/2077920

Title:
  [RTL8821CE] awful performance

Status in linux package in Ubuntu:
  New

Bug description:
  In most application there is "not responding" window displayed.
  Firefox, Google Chrome, Google Remote Desktopm (=Chrome). In Google
  Remote Desktop the sound is transfered in a "okish" delay. The display
  of the remote machine is delayed by about 2-5 seconds.

  The laptop is connected by wifi, the remote machine is connected by lan cable.
  The problem also occur if the laptop is used in the same network about 2-3 
meters away.

  There seems to be a driver issue. If graphic, "chipset", ram or harddisk: I 
dont know. The machine is very old but is quad core with 4 gb of ram. There 
SHOULD be a better performance.
  I used a dual core about 3-4 years ago and the performance was similar to 
this laptop now.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: xorg 1:7.7+23ubuntu3
  ProcVersionSignature: Ubuntu 6.8.0-41.41-generic 6.8.12
  Uname: Linux 6.8.0-41-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
  CasperMD5CheckResult: pass
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Aug 27 05:28:35 2024
  DistUpgraded: 2024-05-10 01:30:53,777 DEBUG migrateToDeb822Sources()
  DistroCodename: noble
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Stoney [Radeon R2/R3/R4/R5 Graphics] 
[1002:98e4] (rev d4) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Stoney [Radeon R2/R3/R4/R5 Graphics] 
[103c:84d0]
  InstallationDate: Installed on 2023-08-26 (366 days ago)
  InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
  MachineType: HP HP Laptop 17-ca0xxx
  ProcEnviron:
   LANG=de_DE.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-41-generic 
root=UUID=23ccbdb2-528b-483e-9b2f-bd788ab9318a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to noble on 2024-05-09 (109 days ago)
  dmi.bios.date: 11/27/2023
  dmi.bios.release: 15.66
  dmi.bios.vendor: AMI
  dmi.bios.version: F.66
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 84D0
  dmi.board.vendor: HP
  dmi.board.version: 90.48
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.ec.firmware.release: 90.48
  dmi.modalias: 
dmi:bvnAMI:bvrF.66:bd11/27/2023:br15.66:efr90.48:svnHP:pnHPLaptop17-ca0xxx:pvr:rvnHP:rn84D0:rvr90.48:cvnHP:ct10:cvrChassisVersion:sku5CU45EA#ABD:
  dmi.product.family: 103C_5335KV HP Notebook
  dmi.product.name: HP Laptop 17-ca0xxx
  dmi.product.sku: 5CU45EA#ABD
  dmi.sys.vendor: HP
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.120-2build1
  version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.9-0ubuntu0.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
  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 
1:1.0.17-2build1

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