Public bug reported:
With WoWLAN enabled on the onboard Qualcomm WCN785x (ath12k), the system never
comes back from suspend. With WoWLAN disabled, suspend/resume works normally.
Steps to reproduce:
1. sudo iw phy0 wowlan enable magic-packet
2. systemctl suspend (mem_sleep = deep)
3. Wake the machine (a magic packet over Wi-Fi does power it back on)
Expected: system resumes.
Actual: the machine powers back on but the display stays black and it never
recovers. The motherboard's DRAM and VGA Q-LEDs stay lit. It needs a hard
power-off. The persistent journal ends at "PM: suspend entry (deep)"; nothing
from the resume is logged. After the hard power-off, the next cold boot
retrains DDR5 (DRAM Q-LED for 1-2 minutes) before booting normally.
Reproduction rate:
- WoWLAN enabled: 6 of 6 suspends failed (5 with mem_sleep=deep, 1 with
mem_sleep=s2idle).
- WoWLAN disabled: S3 suspend/resume has worked daily for weeks on this
machine, including once on the same day as the failures with the same
kernel and NVIDIA driver.
- I have not separately tested a power-button wake with WoWLAN enabled, so I
can't say whether arming WoWLAN alone or waking via Wi-Fi triggers it.
pm_trace: one failed resume was run with /sys/power/pm_trace=1. The next boot
printed "PM: Magic number: 0:858:790" with no "hash matches" line, so it
was inconclusive.
Other configuration that may be relevant:
- NVIDIA open kernel module 595.99.02 is loaded (kernel tainted), with
NVreg_UseKernelSuspendNotifiers=1 and NVreg_PreserveVideoMemoryAllocations=1;
nvidia-suspend/resume/hibernate services are disabled.
- A /usr/lib/systemd/system-sleep hook sets power/wakeup=disabled on all USB
controllers and on root ports 0000:00:02.1 and 0000:00:02.2 before suspend,
to stop spurious USB PME wakeups on this board. The Wi-Fi card sits under
00:02.1 but has its own ACPI wake device (NV00) and magic-packet wake works.
- systemd-suspend.service has SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=false
(Ubuntu default drop-in).
System:
- Ubuntu 26.04.1 LTS, distro kernel, no extra patches
- uname -a: Linux ari 7.0.0-38-generic #38-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep
4 09:10:14 UTC 2026 x86_64 GNU/Linux
- Board: ASUS ProArt X870E-CREATOR WIFI, BIOS 2202 (04/09/2026)
- CPU: AMD Ryzen 9 9950X3D
- GPU: NVIDIA RTX 5090, nvidia-driver-595-open 595.99.02
- linux-firmware 20260319.git217ca6e4.1ubuntu
lspci -mnn:
09:00.0 "Network controller [0280]" "Qualcomm Technologies, Inc [17cb]"
"WCN785x Wi-Fi 7(802.11be) 320MHz 2x2 [FastConnect 7800] [1107]" -r01 -p00
"Foxconn International, Inc. [105b]" "Device [e10a]"
find /lib/firmware/ath12k/ -type f | xargs md5sum (WCN7850):
1cacb8347a9275aa29f7cd92f1fea54c
/lib/firmware/ath12k/WCN7850/hw2.0/amss.bin.zst
953ba9719c55664a5d91d99b412caee1
/lib/firmware/ath12k/WCN7850/hw2.0/Notice.txt.zst
8ee2ebb8bc7c70b27d9933794e450b1b
/lib/firmware/ath12k/WCN7850/hw2.0/board-2.bin.zst
2ecd46cdee0ae8de657d900dd9824ad6 /lib/firmware/ath12k/WCN7850/hw2.0/m3.bin.zst
e8cb09096a24b2f286657ed26c9810f1
/lib/firmware/ath12k/WCN7850/hw2.0/ncm865/amss.bin.zst
dmesg | grep ath12k:
ath12k_wifi7_pci 0000:09:00.0: BAR 0 [mem 0xf2600000-0xf27fffff 64bit]: assigned
ath12k_wifi7_pci 0000:09:00.0: enabling device (0000 -> 0002)
ath12k_wifi7_pci 0000:09:00.0: Wi-Fi 7 Hardware name: wcn7850 hw2.0
ath12k_wifi7_pci 0000:09:00.0: MSI vectors: 16
ath12k_wifi7_pci 0000:09:00.0: chip_id 0x2 chip_family 0x4 board_id 0xff soc_id
0x40170200
ath12k_wifi7_pci 0000:09:00.0: fw_version 0x1103006c fw_build_timestamp
2026-03-06 09:10 fw_build_id
QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3
ath12k_wifi7_pci 0000:09:00.0 wlp9s0: renamed from wlan0
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/controlC2: aliozkaya 4340 F.... wireplumber
/dev/snd/controlC0: aliozkaya 4340 F.... wireplumber
/dev/snd/controlC1: aliozkaya 4340 F.... wireplumber
/dev/snd/seq: aliozkaya 4172 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 11 21:36:16 2026
InstallationDate: Installed on 2026-01-10 (274 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: ASUS System Product Name
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic
root=UUID=516337f1-832f-43c5-b7e2-8efd9a1044b4 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/09/2026
dmi.bios.release: 22.2
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2202
dmi.board.asset.tag: Default string
dmi.board.name: ProArt X870E-CREATOR WIFI
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr2202:bd04/09/2026:br22.2:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnProArtX870E-CREATORWIFI:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2170503
Title:
ath12k WCN7850: system hangs on resume from suspend when WoWLAN magic-
packet is enabled
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