Public bug reported:
Description:
After a clean shutdown, the system immediately powers back on within 1-2
seconds. The shutdown sequence completes normally (journal shows "System Power
Off" and "Journal stopped"), but the hardware restarts on its own.
Hardware:
Lenovo ThinkPad P14s Gen 5 (Intel) - Model 21G2002BUS
CPU: Intel Core Ultra 7 155H (Meteor Lake)
BIOS: R2DET40W (1.25) - latest available
GPU: Intel Arc Graphics (using prime-select intel)
Software:
Ubuntu Studio 24.04.3 LTS
Tested on both 6.8.0-90-lowlatency and 6.14.0-37-generic kernels - same behavior
Key observation:
Windows 11 (dual boot) shuts down and stays off
Linux shutdown completes cleanly per journalctl, then hardware restarts
Troubleshooting attempted (none resolved the issue):
Disabled all ACPI wakeup sources via /proc/acpi/wakeup
Embedded Controller reset (30-second power button hold)
Kernel parameters: acpi=force, reboot=acpi, reboot=efi
Blacklisted mei_me module
Disabled TLP power management
Disabled "USB Always On" and all wake options in BIOS
Downgraded linux-firmware from 0ubuntu2.22 to 0ubuntu2.21
Removed xfce4-session package
systemctl poweroff --force (still restarts)
systemctl halt --force --force (hangs, stays off only after holding power
button)
Journal excerpt (last lines before restart):
systemd[1]: Reached target poweroff.target - System Power Off.
systemd[1]: Shutting down.
systemd-shutdown[1]: Syncing filesystems and block devices.
systemd-shutdown[1]: Sending SIGTERM to remaining processes...
systemd-journald[788]: Journal stopped
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-90-lowlatency 6.8.0-90.91.1
ProcVersionSignature: Ubuntu 6.8.0-90.91.1-lowlatency 6.8.12
Uname: Linux 6.8.0-90-lowlatency x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: dunyo 3874 F.... pipewire
dunyo 3880 F.... wireplumber
/dev/snd/seq: dunyo 3874 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Wed Jan 14 00:23:54 2026
InstallationDate: Installed on 2025-11-27 (48 days ago)
InstallationMedia: Ubuntu-Studio 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805)
MachineType: LENOVO 21G2002BUS
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-90-lowlatency
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash preempt=full
rcu_nocbs=all threadirqs vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-90-lowlatency N/A
linux-backports-modules-6.8.0-90-lowlatency N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.22
SourcePackage: linux-lowlatency
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/28/2025
dmi.bios.release: 1.25
dmi.bios.vendor: LENOVO
dmi.bios.version: R2DET40W (1.25 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21G2002BUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.16
dmi.modalias:
dmi:bvnLENOVO:bvrR2DET40W(1.25):bd08/28/2025:br1.25:efr1.16:svnLENOVO:pn21G2002BUS:pvrThinkPadP14sGen5:rvnLENOVO:rn21G2002BUS:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21G2_BU_Think_FM_ThinkPadP14sGen5:
dmi.product.family: ThinkPad P14s Gen 5
dmi.product.name: 21G2002BUS
dmi.product.sku: LENOVO_MT_21G2_BU_Think_FM_ThinkPad P14s Gen 5
dmi.product.version: ThinkPad P14s Gen 5
dmi.sys.vendor: LENOVO
** Affects: linux-lowlatency (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2138359
Title:
system restarts immediately after shutdown
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