[Bug 2162928] Re: [amdgpu][Navi 44] Intermittent poweroff hang on 7.0.0-27/28/29; 7.0.0-22 and nomodeset shut down reliably

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Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2162928 Title: [amdgpu][Navi 44] Intermittent poweroff hang on 7.0.0-27/28/29; 7.0.0-22 and nomodeset shut down reliably Status in linux package in Ubuntu: New Bug description: Ubuntu release: Ubuntu 26.04 LTS (Kubuntu, resolute), amd64 Hardware: - GPU: PowerColor AMD Radeon RX 9060 XT / Navi 44 [1002:7590], subsystem [148c:2437] - Motherboard: Gigabyte B650 GAMING X AX V2 rev. 1.2 - BIOS: F41 dated 2026-05-21 - Secure Boot: enabled - All monitors are connected to the RX 9060 XT - The Ryzen integrated GPU has been disabled in BIOS for an additional isolation test Current relevant software: - Failing kernel: Ubuntu 7.0.0-29.29-generic (upstream base 7.0.12) - AMD graphics firmware: linux-firmware-amd-graphics 20260319.git217ca6e4-0ubuntu3.1 - Kernel driver: amdgpu Problem: Poweroff intermittently fails at the final stage. The displays and USB devices turn off, but the computer remains powered indefinitely: the case power light remains on and the fans appear to continue running. A hard reset/power-off is then required. The failure occurs both when shutting down from KDE and with: sudo systemctl poweroff It also occurred after shutting down from SDDM, so it is not dependent on a logged-in KDE session. Persistent journal logging reaches systemd-shutdown, filesystem synchronization, and process termination, then stops without recording the component that prevents final power removal. Expected result: The machine should completely power off within several seconds, as it does with kernel 7.0.0-22 and when amdgpu is bypassed with nomodeset. Reproduction: 1. Boot Ubuntu normally using kernel 7.0.0-29-generic with amdgpu loaded. 2. Run `sudo systemctl poweroff` or select Shut Down from KDE. 3. Repeat the boot/poweroff cycle because the failure is intermittent. 4. On a failed attempt, the displays and USB devices turn off but the power LED and fans remain on indefinitely. Isolation results: - Kernel 7.0.0-29 with normal amdgpu operation: intermittent poweroff hangs reproduced multiple times. - Kernel 7.0.0-27 with normal amdgpu operation: hung on the first shutdown test. - The problem was already observed with kernel 7.0.0-28 and remains present with 7.0.0-29. - Kernel 7.0.0-29 booted with `nomodeset`: 5 out of 5 shutdown tests completed cleanly and almost immediately. - Kernel 7.0.0-22 with normal amdgpu operation: 4 out of 4 shutdown tests completed cleanly and quickly. - Fedora Workstation 44 live USB with normal graphics: 3 out of 3 shutdown tests completed cleanly. - Disabling the unused Ryzen/Raphael integrated GPU in BIOS did not help; the first normal shutdown with only the RX 9060 XT present hung. - Updating the motherboard BIOS to F41 did not help. - `amdgpu.runpm=0` did not resolve the problem. - Stopping OneDrive before shutdown did not help. - The failure has occurred after KDE, SDDM, and direct systemctl poweroff tests, making a KDE session or ordinary userspace service unlikely to be necessary for the failure. This appears to be a regression in the Ubuntu kernel's amdgpu shutdown path between Ubuntu kernels 7.0.0-22 (upstream base 7.0.0) and 7.0.0-27 (upstream base 7.0.6). I can test additional proposed kernels if requested. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-29-generic 7.0.0-29.29 ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12 Uname: Linux 7.0.0-29-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: chrism 2704 F.... wireplumber /dev/snd/controlC1: chrism 2704 F.... wireplumber /dev/snd/controlC0: chrism 2704 F.... wireplumber /dev/snd/seq: chrism 2699 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Wed Aug 5 12:08:19 2026 InstallationDate: Installed on 2026-03-24 (135 days ago) InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007) IwDevWlp9s0Link: Not connected. MachineType: Gigabyte Technology Co., Ltd. B650 GAMING X AX V2 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-29-generic root=UUID=618adf22-c64b-4c7d-8b93-6242ab08ed44 ro 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 2026-05-18 (79 days ago) dmi.bios.date: 05/21/2026 dmi.bios.release: 5.41 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: F41 dmi.board.asset.tag: Default string dmi.board.name: B650 GAMING X AX V2 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF41:bd05/21/2026:br5.41:svnGigabyteTechnologyCo.,Ltd.:pnB650GAMINGXAXV2:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB650GAMINGXAXV2:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaB650MB: dmi.product.family: B650 MB dmi.product.name: B650 GAMING X AX V2 dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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