Public bug reported:
## Summary
On Ubuntu 26.04 LTS, kernel 7.0.0-28-generic fails to shutdown or reboot
properly on ThinkPad T14 Gen 2 (Ryzen 5 Pro). System reaches final.target,
black screen, but power LED stays on indefinitely.
## Affected Hardware
- ThinkPad T14 Gen 2 (Type 20UF)
- AMD Ryzen 5 Pro 5650U
- Integrated AMD Vega Graphics (amdgpu)
## Affected Kernel
- 7.0.0-28-generic: FAILS
- 7.0.0-27-generic: WORKS
## Steps to Reproduce
1. Boot kernel 7.0.0-28
2. Attempt shutdown or reboot via UI or CLI
3. System hangs with black screen, power LED remains on
4. Requires force power-off
## Root Cause
systemd successfully reaches shutdown.target and final.target (journalctl
confirms all services stopped cleanly). System hangs at kernel ACPI power
management stage, likely amdgpu driver regression in 7.0.0-28.
## Workaround
Downgrade to kernel 7.0.0-27-generic.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-27-generic 7.0.0-27.27
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckMismatches: ./boot/grub/grub.cfg
CasperMD5CheckResult: fail
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 20 00:18:57 2026
InstallationDate: Installed on 2026-05-08 (72 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 20XLS0T500
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-kitty
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-27-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro pcie_aspm=off pci=noaer acpi=debug
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/16/2026
dmi.bios.release: 1.34
dmi.bios.vendor: LENOVO
dmi.bios.version: R1MET64W (1.34 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20XLS0T500
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.34
dmi.modalias:
dmi:bvnLENOVO:bvrR1MET64W(1.34):bd04/16/2026:br1.34:efr1.34:svnLENOVO:pn20XLS0T500:pvrThinkPadT14Gen2a:rvnLENOVO:rn20XLS0T500:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XL_BU_Think_FM_ThinkPadT14Gen2a:pfaThinkPadT14Gen2a:
dmi.product.family: ThinkPad T14 Gen 2a
dmi.product.name: 20XLS0T500
dmi.product.sku: LENOVO_MT_20XL_BU_Think_FM_ThinkPad T14 Gen 2a
dmi.product.version: ThinkPad T14 Gen 2a
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161289
Title:
Kernel 7.0.0-28-generic: system hangs on shutdown/reboot on ThinkPad
T14 Gen 2 AMD
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