[amdgpu] alienware aw3423dwf flickers at 165hz under linux only.

[Al]

alienware aw3423dwf flickers when set to 165hz. Doesn't at 100hz. Works fine under windows. GPU is Radeon 6950XT. If I change refresh rate down to 100hz it's fine.

Happened on 22.04 LTS, and the amdgpu ppa made games not work, so I upgraded to 22.10 instead.

Description: Ubuntu 22.10
Release: 22.10

I expect the display not to flicker at 165hz. monitor doesn't lose sync, it's just like a few pixel wide bar that runs the width of the screen that shows up randomly for a fraction of a second. Happens when just using the desktop environment, not sure if it happens when playing a game.

filename: /lib/modules/5.15.0-52-generic/kernel/drivers/gpu/drm/amd/amdgpu/amdgpu.ko
srcversion: BB7C61D4A8F6AFF924034AA

99% sure I should be under X11, not wayland.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: gnome-shell 43.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-52.58-generic 5.15.60
Uname: Linux 5.15.0-52-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.23.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Mon Jan 23 18:38:03 2023
DisplayManager: sddm
InstallationDate: Installed on 2022-10-23 (92 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
RelatedPackageVersions: mutter-common 43.0-1ubuntu4
ShellJournal: -- No entries --
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to kinetic on 2022-11-06 (78 days ago)

[Daniel van Vugt (vanvugt)]

This sounds like a bandwidth management issue, which I know Linux doesn't do as well as Windows (on Intel graphics either).

Firstly you seem to have the wrong (old) kernel still installed. It should be version 5.19 so please try fixing that with:

  sudo apt install linux-generic

or

  sudo apt install linux-generic-hwe-22.04

and reboot.

If the problem persists after that then please run:

  journalctl -b0 > journal.txt
  lspci -k > lspci.txt

and attach the resulting text files here.

[Daniel van Vugt (vanvugt)]

Oh no, you seem to have installed graphics packages from the 'oibaf' PPA. That PPA is known to cause bugs like this and is unsupported.

Please remove the PPA from your system completely, and then report a new bug if the flickering persists.