Public bug reported:
Confirmed through multiple different experiments, the laptop fails to
suspend to s2idle due to an issue directly tied to the activity state of
the keyboard's low-level hardware controller. The failure is 100%
reproducible.
If a suspend is initiated within approximately **20-30 seconds of the
last keyboard key press**, the suspend fails. The system attempts to
enter suspend for a few seconds and then immediately wakes up. The key
indicator of failure in the kernel log is the message `kernel: amd_pmc
... Last suspend didn't reach deepest state`, indicating the hardware
failed to enter its sleep state.
This behavior strongly suggests that the keyboard's controller (likely
the Embedded Controller or EC) has an internal activity timer. If the OS
requests a system-wide suspend while this timer is still active, the
controller's firmware fails to handle the suspend signal correctly,
causing the entire process to abort.
The keyboard backlight serves as a useful visual indicator of this controller's
active state:
- If the backlight is configured in BIOS settings to "Never" time out, the
controller remains permanently active, and **suspend fails 100% of the time.**
- If the backlight is allowed to time out, suspend will succeed reliably **only
after** the timeout period has passed.
Critically, even disabling the backlight entirely using the shortcut
ALT+F11 does not fix the issue. I believe this is because the bug lies
with the EC's core activity timer which happens to have the same timeout
as the keyboard's backlight.
### Steps to Reproduce
1. Press any key on the keyboard to trigger the controller's active state.
2. Immediately (within ~10 seconds) run sudo systemctl suspend.
3. **Observe Failure:** The system will wake up immediately.
4. After waking, wait for 30 seconds without pressing the keyboard, allowing
the controller to return to an idle state.
5. Run sudo systemctl suspend again.
6. **Observe Success:** The system will now suspend correctly.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-24-generic 6.14.0-24.24~24.04.3
ProcVersionSignature: Ubuntu 6.14.0-24.24~24.04.3-generic 6.14.6
Uname: Linux 6.14.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: edllt 2496 F.... wireplumber
/dev/snd/controlC0: edllt 2496 F.... wireplumber
/dev/snd/controlC1: edllt 2496 F.... wireplumber
/dev/snd/seq: edllt 2492 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: fail
CurrentDesktop: ubuntu:GNOME
Date: Tue Jul 29 03:29:57 2025
InstallationDate: Installed on 2025-07-20 (8 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
MachineType: Acer Nitro ANV15-41
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-24-generic
root=UUID=006e355c-90b4-4948-858d-60a40874317a ro nvidia-drm.modeset=1
nvidia.NVreg_PreserveVideoMemoryAllocations=1
RelatedPackageVersions:
linux-restricted-modules-6.14.0-24-generic N/A
linux-backports-modules-6.14.0-24-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.14
SourcePackage: linux-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/02/2025
dmi.bios.release: 1.18
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: V1.18
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Sportage_RBH
dmi.board.vendor: RB
dmi.board.version: V1.18
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 1.9
dmi.modalias:
dmi:bvnINSYDECorp.:bvrV1.18:bd07/02/2025:br1.18:efr1.9:svnAcer:pnNitroANV15-41:pvrV1.18:rvnRB:rnSportage_RBH:rvrV1.18:cvnAcer:ct10:cvrChassisVersion:sku0000000000000000:
dmi.product.family: Acer Nitro V 15
dmi.product.name: Nitro ANV15-41
dmi.product.sku: 0000000000000000
dmi.product.version: V1.18
dmi.sys.vendor: Acer
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2118955
Title:
[s2idle] Suspend fails on Acer Nitro ANV15-41 when keyboard controller
is active
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