Public bug reported:
Yoga Slim 7 14AKP10 (Krackan Point): ~38.6 s s2idle resume stall
ending in NVMe IO_PAGE_FAULT, fixed by iommu=pt
System
Lenovo Yoga Slim 7 14AKP10, AMD Ryzen AI 5 330 (Krackan Point), Radeon 820M, 16
GB
NVMe: Micron 2400 MTFDKCD512TGW-1BP1AABLA, firmware 1002VALN (DRAM-less, uses
HMB)
Kubuntu 26.04.1 LTS, kernel 7.0.0-31-generic
BIOS QTCN33WW (2026-04-24), Pluton disabled in BIOS; no newer firmware on LVFS
/sys/power/mem_sleep = [s2idle] (no deep/S3 available)
Symptom
After s2idle suspend (lid or systemctl suspend), affected resumes take ~38 to
40 s before the login screen appears. The delay is almost
constant (38.57 s / 38.61 s / 38.61 s over three cycles). Some resumes are
immediate, so the issue is intermittent but easily reproducible.
What was measured
amd_pmc s0ix_stats: S0i3 entry succeeds, ~151 ms to resume from S0i3, so the
SoC/SMU side is fine.
pm_print_times: endpoint callbacks are fast (amdgpu ~185 ms, USB max ~266 ms,
nvme pci_pm_resume 2 µs since it only schedules an
async reset).
In dmesg the stall sits between ACPI: EC: interrupt unblocked and the following
line, which is logged exactly at the end of the ~38.6
s gap:
nvme 0000:bf:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x0010
address=0x77e54000 flags=0x0000]
immediately followed by amdgpu ... SMU is resuming, nvme nvme0: 8/0/0
default/read/poll queues and PM: suspend exit.
The firmware also repeatedly logs, at suspend entry and/or exit:
ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.LPC0.EC0.OSFG],
AE_NOT_FOUND
ACPI Error: Aborting method \_SB.PEP._DSM due to previous error (AE_NOT_FOUND)
so the LPS0 (Modern Standby) entry/exit notification to the platform aborts.
Workaround (verified)
Booting with iommu=pt completely removes the stall and the IO_PAGE_FAULT over
repeated systemctl suspend cycles (20–30 s sleep). Nothing
else was changed. The ACPI OSFG / PEP._DSM error is still logged with the
workaround.
Parameters deliberately not used: amd_iommu=off, nvme.noacpi=1, iommu=soft,
pcie_aspm=off.
Interpretation
The IO_PAGE_FAULT is the marker of the end of the stall, not its cause: after
leaving D3cold the NVMe controller issues DMA with a stale address,
the IOMMU rejects it in the default translated mode, and the controller stays
in a bad state until a ~38.6 s timeout expires, after which resume
completes normally. With identity mapping (iommu=pt) the stale address stays
valid and the device answers immediately. This looks like a
platform + NVMe (Micron 2400 / HMB / D3cold) resume-ordering issue rather than
a userspace, GPU or SMU delay. The aborted PEP._DSM may
contribute to the intermittency (the EC may not be told the OS left standby);
that part needs a DSDT review.
Requests
Kernel/AMD: consider a quirk for this platform/SSD combination (e.g. IOMMU
passthrough by default for this DMI, or HMB/D3cold handling
on resume) so it works out of the box.
Lenovo: fix the firmware ACPI tables so that \_SB.PCI0.LPC0.EC0.OSFG,
referenced by \_SB.PEP._DSM, exists.
Reproduction
Boot Kubuntu without iommu=pt; check /sys/power/mem_sleep shows [s2idle].
systemctl suspend, wait 20–30 s, wake.
On an affected cycle, observe ~38 s before the login screen; in dmesg the gap
is between ACPI: EC: interrupt unblocked and nvme
... AMD-Vi: Event logged [IO_PAGE_FAULT ...].
Reboot with iommu=pt, repeat 2–3: no stall, no fault.
Full report (French, with logs and s0ix_stats) and amd-s2idle output attached
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-31-generic 7.0.0-31.31
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Sep 6 21:18:48 2026
InstallationDate: Installed on 2026-09-06 (0 days ago)
InstallationMedia: Kubuntu 26.04.1 LTS "Resolute Raccoon" - Release amd64
(20260826.1)
MachineType: LENOVO 83JY
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic
root=UUID=764762f1-5e87-46be-869b-a6869d0d88f0 ro quiet splash iommu=pt
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/24/2026
dmi.bios.release: 1.33
dmi.bios.vendor: LENOVO
dmi.bios.version: QTCN33WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76573 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Yoga Slim 7 14AKP10
dmi.ec.firmware.release: 1.33
dmi.modalias:
dmi:bvnLENOVO:bvrQTCN33WW:bd04/24/2026:br1.33:efr1.33:svnLENOVO:pn83JY:pvrYogaSlim714AKP10:rvnLENOVO:rnLNVNB161216:rvrSDK0T76573WIN:cvnLENOVO:ct10:cvrYogaSlim714AKP10:skuLENOVO_MT_83JY_BU_idea_FM_YogaSlim714AKP10:pfaYogaSlim714AKP10:
dmi.product.family: Yoga Slim 7 14AKP10
dmi.product.name: 83JY
dmi.product.sku: LENOVO_MT_83JY_BU_idea_FM_Yoga Slim 7 14AKP10
dmi.product.version: Yoga Slim 7 14AKP10
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added:
"rapport_bug_resume_suspend_lenovo_yoga_slim_7_14AKP10_v2.docx"
https://bugs.launchpad.net/bugs/2166622/+attachment/5998010/+files/rapport_bug_resume_suspend_lenovo_yoga_slim_7_14AKP10_v2.docx
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https://bugs.launchpad.net/bugs/2166622
Title:
Yoga Slim 7 14AKP10: ~38 s s2idle resume stall, NVMe IO_PAGE_FAULT,
fixed by iommu=pt
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