[Bug 2167015] [NEW] System hangs on poweroff since kernel 7.0.0 series (regression) on ThinkPad L14 Gen1 AMD

Public bug reported: Since upgrading to kernel 7.0.0-28-generic (and confirmed also in 7.0.0-30 and 7.0.0-31), my system no longer powers off cleanly. This is a clear regression: kernel 6.17.0-40-generic works reliably on the exact same hardware/install. Hardware: Lenovo ThinkPad L14 Gen 1 AMD (Type 20U5/20U6), AMD Ryzen 5 PRO 4650U, BIOS R19ET56W (1.40). Distro: Linux Mint (based on Ubuntu 24.04 / noble, HWE kernel stack) Symptom: When shutting down, all systemd services stop cleanly and the log reaches "Reached target poweroff.target", "Syncing filesystems and block devices", "Sending SIGTERM to remaining processes" - then the journal stops. The screen goes black, but the fans keep spinning and the power LED stays on. The system never actually powers off; it requires a hard power-button hold to turn off. Tested and confirmed: - Broken: 7.0.0-28-generic, 7.0.0-30-generic, 7.0.0-31-generic - Working: 6.17.0-40-generic, 6.17.0-35-generic (both shut down cleanly every time) No custom kernel parameters were needed on the working kernels (default "quiet splash"). Testing with acpi=force / reboot=acpi / acpi_osi=Linux on the broken kernel did not help and even caused reboot to hang as well. This looks like a regression in ACPI/power-management handling introduced somewhere between 6.17.0-40 and 7.0.0-28. Steps to reproduce: 1. Boot into kernel 7.0.0-31-generic (or 7.0.0-28/30) 2. Run "sudo poweroff" or shut down via the desktop menu 3. Observe: screen turns black, fans keep running, power LED stays on, system never actually powers off Expected result: System powers off completely. Actual result: System hangs indefinitely until a hard power-button shutdown is performed. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2167015 Title: System hangs on poweroff since kernel 7.0.0 series (regression) on ThinkPad L14 Gen1 AMD Status in linux package in Ubuntu: New Bug description: Since upgrading to kernel 7.0.0-28-generic (and confirmed also in 7.0.0-30 and 7.0.0-31), my system no longer powers off cleanly. This is a clear regression: kernel 6.17.0-40-generic works reliably on the exact same hardware/install. Hardware: Lenovo ThinkPad L14 Gen 1 AMD (Type 20U5/20U6), AMD Ryzen 5 PRO 4650U, BIOS R19ET56W (1.40). Distro: Linux Mint (based on Ubuntu 24.04 / noble, HWE kernel stack) Symptom: When shutting down, all systemd services stop cleanly and the log reaches "Reached target poweroff.target", "Syncing filesystems and block devices", "Sending SIGTERM to remaining processes" - then the journal stops. The screen goes black, but the fans keep spinning and the power LED stays on. The system never actually powers off; it requires a hard power-button hold to turn off. Tested and confirmed: - Broken: 7.0.0-28-generic, 7.0.0-30-generic, 7.0.0-31-generic - Working: 6.17.0-40-generic, 6.17.0-35-generic (both shut down cleanly every time) No custom kernel parameters were needed on the working kernels (default "quiet splash"). Testing with acpi=force / reboot=acpi / acpi_osi=Linux on the broken kernel did not help and even caused reboot to hang as well. This looks like a regression in ACPI/power-management handling introduced somewhere between 6.17.0-40 and 7.0.0-28. Steps to reproduce: 1. Boot into kernel 7.0.0-31-generic (or 7.0.0-28/30) 2. Run "sudo poweroff" or shut down via the desktop menu 3. Observe: screen turns black, fans keep running, power LED stays on, system never actually powers off Expected result: System powers off completely. Actual result: System hangs indefinitely until a hard power-button shutdown is performed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2167015/+subscriptions