[Bug 2169402] Re: Kernel 7.0.0-38 regression: screen corruption flashes on RX 7600 XT (Wayland, VRR), 7.0.0-34 unaffected

Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2169402 Title: Kernel 7.0.0-38 regression: screen corruption flashes on RX 7600 XT (Wayland, VRR), 7.0.0-34 unaffected Status in linux package in Ubuntu: Confirmed Bug description: After the update from 7.0.0-34-generic to 7.0.0-38-generic (Oct 2, 2026), I get short flashes of screen corruption on my desktop. When you move around windows or sometimes random, blocks of colored noise appear. Regression: - 7.0.0-34-generic: no corruption - 7.0.0-38-generic: corruption, intermittent - Windows 11 on the same machine (dual boot): no corruption, so hardware seems fine Trigger: - Launching VS Code (Electron/Chromium) triggerd it. - Otherwise it is intermittent and can disappear for a while. System: - Kubuntu 26.04, Plasma 6.6.6, Wayland session - Mesa 26.0.8-1ubuntu0.3 - GPU: AMD Radeon RX 7600 XT [1002:7480], DCN 3.2.1 - CPU: Ryzen 5 7600, integrated GPU [1002:164e] enabled but no display connected - DP-1: LG UltraGear 1920x1080 @ 179.96 Hz, VRR Automatic, 10 bpc - DP-2: Dell U2419H 1920x1080 @ 60 Hz, VRR incapable Kernel log on 7.0.0-38 (no GPU resets or ring timeouts): workqueue: dm_handle_vmin_vmax_update [amdgpu] hogged CPU for >10000us 131 times, consider switching to WQ_UNBOUND Tried on 7.0.0-38 (brief tests only, since the issue is intermittent): VRR set to Never, 8 bpc, tearing disabled, 144 Hz. None clearly fixed it. Workaround: booting 7.0.0-34-generic. 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 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Sat Oct 3 12:21:30 2026 InstallationDate: Installed on 2024-10-20 (712 days ago) InstallationMedia: Kubuntu 24.10 "Oracular Oriole" - Release amd64 (20241007.6) MachineType: Micro-Star International Co., Ltd. MS-7E26 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-34-generic root=UUID=634abc01-8b3c-4d75-baeb-4749e779b55f ro quiet splash 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 2026-05-15 (141 days ago) dmi.bios.date: 12/27/2024 dmi.bios.release: 5.35 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 1.I0 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: B650 GAMING PLUS WIFI (MS-7E26) dmi.board.vendor: Micro-Star International Co., Ltd. dmi.board.version: 1.0 dmi.chassis.asset.tag: To be filled by O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Micro-Star International Co., Ltd. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr1.I0:bd12/27/2024:br5.35:svnMicro-StarInternationalCo.,Ltd.:pnMS-7E26:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnB650GAMINGPLUSWIFI(MS-7E26):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuTobefilledbyO.E.M.:pfaTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: MS-7E26 dmi.product.sku: To be filled by O.E.M. dmi.product.version: 1.0 dmi.sys.vendor: Micro-Star International Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2169402/+subscriptions