** Description changed: # Probable AMDGPU-related reboot regression on Ubuntu HWE 7.0 - Prepared locally on 2026-09-13. This report has not been submitted or - published. + Prepared locally on 2026-09-13. Tested on Linux Mint 22.3 using Ubuntu- + provided kernels. This has not yet been reproduced on an Ubuntu + installation. ## Summary On Linux Mint 22.3 (Ubuntu 24.04 base), restarting with Ubuntu HWE kernel 7.0 can leave the screen off and fans running/ramping, requiring a power-button reset. Kernel 6.17.0-40 has restarted successfully with graphics enabled and is the current workaround. Normal power-off and restart directly from BIOS have also worked. The strongest comparison is between two text-mode boots of the same 7.0.0-31 kernel: reboot hung with Intel graphics blocked and AMDGPU initialized; reboot succeeded after additionally blocking AMDGPU. This strongly implicates the AMDGPU initialization/shutdown path or its interaction with other kernel components. It does not establish the exact defective function or commit. A malformed earlier blacklist test reportedly restarted with Intel still loaded, so intermittency remains possible. ## Environment - Linux Mint 22.3, Ubuntu noble base, x86_64. - Working installed kernel: 6.17.0-40-generic, package 6.17.0-40.40~24.04.1. - Failing kernel: 7.0.0-31-generic, package 7.0.0-31.31~24.04.1, upstream version reported as 7.0.14. - Also reported failing: 7.0.0-28 and 7.0.0-30. - Discrete GPU: AMD Navi 31, PCI ID 1002:744c, ASRock subsystem 1849:5308. PCI naming covers RX 7900 XT/XTX variants; exact retail model not established here. - Integrated GPU: Intel Alder Lake-S GT1, PCI ID 8086:4680, i915 driver under normal operation. - Motherboard: MSI PRO Z690-A WIFI (MS-7D25). - BIOS: A.D0, dated 2023-07-10. ## Tests and evidence | Test | Boot configuration | Reported result | | --- | --- | --- | | Installed 6.17.0-40 | Normal graphical boot | Reboot worked | | Mint live USB, 6.14.0-37 | Live desktop | Reboot worked | | 7.0.0-31 | Normal desktop | Reboot hung | | 7.0.0-31 | `systemd.unit=multi-user.target` | Reboot hung; LightDM did not start | | 7.0.0-31 | `systemd.unit=multi-user.target nomodeset` | Reboot worked | | Test B, 7.0.0-31 | `systemd.unit=multi-user.target module_blacklist=i915,xe` | Latest test hung | | Test C, 7.0.0-31 | `systemd.unit=multi-user.target module_blacklist=i915,xe,amdgpu` | Reboot worked | Test B on September 13 at 10:26 CDT recorded: ```text Module i915 is blacklisted Module xe is blacklisted [drm] Initialized amdgpu 3.64.0 for 0000:03:00.0 on minor 1 ``` Test C on September 13 at 10:33 CDT recorded: ```text Module i915 is blacklisted Module xe is blacklisted Module amdgpu is blacklisted ``` The preserved journal reaches the final systemd shutdown stage and stops when journald terminates. No preserved stack trace identifies the hang. Reaching reboot.target or seeing Journal stopped alone does not prove a reboot succeeded; success/failure outcomes above come from the user's physical observations. Earlier 7.0 boots logged AMD display REG_WAIT timeouts, but those messages alone do not establish the cause. A temporary EFI reset-method test also hung. Current measurements taken during normal operation did not show overheating; temperatures during the actual hang were not captured. ## Current workaround GRUB defaults to 6.17.0-40-generic with normal graphics drivers enabled. The kernel image and module packages are marked manually installed. Kernel updates remain enabled, but newly installed kernels will not automatically replace this explicit default. Local configuration: - `/etc/default/grub.d/99-working-kernel.cfg`: working default and five-second menu. - `/etc/grub.d/42_reboot_diagnostics`: optional tests A, B, C. Do not use the all-GPU blacklist or nomodeset as the normal daily boot configuration if GPU acceleration is required. ## Suggested maintainer follow-up Review as an AMDGPU-related regression between 6.17 and 7.0. Identify a relevant fixed distribution kernel or request targeted late-shutdown traces. Repeat the B/C comparison if needed because the failure may be intermittent. Further isolation should be based on maintainer guidance rather than changing unrelated BIOS settings or disabling broad power- management features. Related reports found during research involve other AMD hardware and do not establish that the same defect or fix applies here. No specific published fix was verified for this machine.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2167190 Title: [amdgpu][Navi 31] Reboot hangs on HWE 7.0; 6.17 works; blocking amdgpu avoids hang To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2167190/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
