Public bug reported:
Lenovo ThinkPad T16 Gen 2 (21HH0047CD), Ubuntu 24.04, Kernel 6.17.0-35.
System crashes with hard reset multiple times per day without kernel panic.
Logs show: "workqueue: acpi_ec_event_processor hogged CPU for >10000us"
Counter escalates from 4 to 100+ over hours until hard reset occurs.
Happens with and without load (Codex CLI, Chrome).
BIOS 1.51, EC 0.1.12, Intel ME 1.40.2765 all up to date.
Kernel params acpi_ec_no_wakeup=1 and workqueue.power_efficient=0 do not fix it.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-35-generic 6.17.0-35.35~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-35.35~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: christian-wang 2892 F.... pipewire
christian-wang 2896 F.... wireplumber
/dev/snd/seq: christian-wang 2892 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 2 11:21:58 2026
InstallationDate: Installed on 2024-09-29 (611 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: LENOVO 21HH0047CD
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-35-generic
root=UUID=9ab43f7d-7605-4e54-96b7-7f146e7ca4bf ro quiet splash
workqueue.power_efficient=0 acpi_ec_no_wakeup=1 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.17.0-35-generic N/A
linux-backports-modules-6.17.0-35-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2025
dmi.bios.release: 1.51
dmi.bios.vendor: LENOVO
dmi.bios.version: N3QET51W (1.51 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21HH0047CD
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76479 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.14
dmi.modalias:
dmi:bvnLENOVO:bvrN3QET51W(1.51):bd10/16/2025:br1.51:efr1.14:svnLENOVO:pn21HH0047CD:pvrThinkPadT16Gen2:rvnLENOVO:rn21HH0047CD:rvrSDK0T76479WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21HH_BU_Think_FM_ThinkPadT16Gen2:
dmi.product.family: ThinkPad T16 Gen 2
dmi.product.name: 21HH0047CD
dmi.product.sku: LENOVO_MT_21HH_BU_Think_FM_ThinkPad T16 Gen 2
dmi.product.version: ThinkPad T16 Gen 2
dmi.sys.vendor: LENOVO
** Affects: linux-hwe-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2154786
Title:
ThinkPad T16 Gen 2: random hard resets, acpi_ec_event_processor
hogging CPU repeatedly
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