** Description changed:

  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)
+ - Working: 6.17.0-40-generic (shuts 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.
+ on the broken kernel did not help.
  
  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.

** Summary changed:

- System hangs on poweroff since kernel 7.0.0 series (regression) on ThinkPad 
L14 Gen1 AMD
+ System hangs on poweroff since kernel 7.0.0 series (regression)

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https://bugs.launchpad.net/bugs/2167015

Title:
  System hangs on poweroff since kernel 7.0.0 series (regression)

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