Public bug reported:
Hardware: Lenovo ThinkBook 16 G8 IAL (21SK), Intel Meteor Lake, BIOS RKCN20WW
OS: Ubuntu 26.04.1 LTS
Kernels: 7.0.0-31 (no problem seen), 7.0.0-34 (problem), 7.0.0-38 (problem)
Problem:
After closing the lid, the laptop enters suspend (PM: suspend entry (s2idle)),
wakes up after ~2 s (PM: suspend exit), is suspended again by logind ~30 s
later, and this repeats until the lid is opened. This gives ~117 suspend
entries per hour and a battery drain of ~20%/h (65% -> 20% in 2 hours).
The problem is intermittent. Of 4 lid closes between 2026-09-30 and
2026-10-01 on kernel 7.0.0-34, two looped (2026-09-30 ~21:05-22:10 and
2026-10-01 19:23-00:18), two suspended normally. The loop also occurred
on 7.0.0-38 (evening of 2026-10-02).
History:
- 7.0.0-31: ~3 weeks of daily use, never more than 3 suspend entries per hour.
- 7.0.0-34 installed 2026-09-27, first loop seen 2026-09-30.
- 7.0.0-38 installed 2026-10-02, loop continued.
- The loops happened on battery, not on AC.
Findings:
- /sys/power/pm_wakeup_irq = 9 (ACPI SCI) after the premature wake-up.
- During ~3-4 min of lid-closed s2idle, /sys/firmware/acpi/interrupts/gpe6D
rose by ~9200 events; gpe6E (the EC GPE, "ACPI: EC: GPE=0x6e") rose by ~270.
- Workaround: kernel parameter acpi_mask_gpe=0x6D. With it, a lid-closed
suspend lasted 5h15m with a single suspend entry and 6% battery drain.
Disabling gpe6D via sysfs did not persist across suspend; only the kernel
parameter held.
Usage pattern: the laptop is suspended every night with the lid closed;
during the day the lid is closed at every study break (every 1-1.5 h).
Unrelated, probably noise: an fwupd UEFI dbx update (20260402 ->
20260707) failed with "expected 20260707 and got (null)".
Please tell me what additional information I should collect.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: pilu 4464 F.... pipewire
pilu 4470 F.... wireplumber
/dev/snd/seq: pilu 4464 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 3 10:06:26 2026
InstallationDate: Installed on 2025-12-16 (290 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: LENOVO 21SK
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-7.0.0-38-generic
root=UUID=aae6094b-c046-479c-97da-6c5624645338 ro quiet splash
acpi_mask_gpe=0x6D
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-09-30 (3 days ago)
dmi.bios.date: 06/06/2025
dmi.bios.release: 1.20
dmi.bios.vendor: LENOVO
dmi.bios.version: RKCN20WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: ThinkBook 16 G8 IAL
dmi.ec.firmware.release: 1.14
dmi.modalias:
dmi:bvnLENOVO:bvrRKCN20WW:bd06/06/2025:br1.20:efr1.14:svnLENOVO:pn21SK:pvrThinkBook16G8IAL:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrThinkBook16G8IAL:skuLENOVO_MT_21SK_BU_idea_FM_ThinkBook16G8IAL:pfaThinkBook16G8IAL:
dmi.product.family: ThinkBook 16 G8 IAL
dmi.product.name: 21SK
dmi.product.sku: LENOVO_MT_21SK_BU_idea_FM_ThinkBook 16 G8 IAL
dmi.product.version: ThinkBook 16 G8 IAL
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/2169388
Title:
ThinkBook 16 G8 IAL (21SK): s2idle suspend/resume loop after lid
close, wake IRQ 9 (ACPI GPE 0x6D), ~20%/h battery drain
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