Hi all, I can confirm that this issue affected my system when running kernels 7.0.0-31-generic and 7.0.0-34-generic on a Dell Pro laptop with AMD Radeon graphics.
The primary symptom was that the system would become completely unresponsive during both restarts and full shutdown/startup cycles. The display would remain black and the system would not recover without a forced power reset. Recovery required holding the power button for approximately 30 seconds, waiting 5 seconds, and then pressing the power button again to start the system. This behaviour occurred during the majority of restart and power cycle operations. Following Krystian's recommendation to test 7.0.0-38-generic (although the referenced wiki page appears to be empty, so I used my own installation method), I found that the issue was completely resolved. To validate the fix, I performed: 10 full shutdown and power-on cycles 10 full system restarts In every test case, the system either restarted successfully or powered on normally with a single press of the power button. I was unable to reproduce the issue while running 7.0.0-38-generic. Please let me know if I can help with further information / logs, or if I can contribute to getting this proposed bugfix into "main" :-) My Rig is as follows: ### System Machine : Dell Pro 16 PC16255 (Dell Pro Laptops) Board : Dell Inc. 18G76C BIOS : 1.17.1 (07/31/2026) CPU : AMD Ryzen AI 7 350 w/ Radeon 860M, 16 threads, ucode 0xb600037 RAM : 30Gi GPU : AMD Radeon 860M [1002:1114] rev c2, driver: amdgpu GFX stack: mesa 25.2.8-0ubuntu0.24.04.2, linux-firmware 20240318.git3b128b60.0ubuntu3.1 ### Software OS : Ubuntu 24.04.5 LTS (amd64) Kernel : 7.0.0-38-generic (pkg 7.0.0-38.38~24.04.4) Previous: 7.0.0-34-generic Installed kernels: 7.0.0-31-generic 7.0.0-34-generic 7.0.0-38-generic Cmdline : BOOT_IMAGE=/vmlinuz-7.0.0-38-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash vt.handoff=7 Tainted : 0 Boot : UEFI, SecureBoot: enabled Session : wayland / KDE DKMS : none APT : proposed pocket enabled Cheers, Mike -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163121 Title: [Regression] Laptop fails to power off completely when HDMI is connected in kernel 7.0.0-28 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163121/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
