Re: ath10k_pci: QCA9377 hard lock on resume from S3/deep suspend

[Omar Abuzaid]

Thanks for the guidance.

I created the upstream kernel Bugzilla report here:

https://bugzilla.kernel.org/show_bug.cgi?id=221921

I also have the Fedora report open as Bugzilla #2523243.

I included the system information, firmware details, reproduction
steps, PCIe/AER errors, and the kernel log from the failed
suspend/resume.

Thanks,
Omar

On Tue, Aug 25, 2026 at 10:36 AM Jeff Johnson
<jeff.johnson@xxxxxxxxxxxxxxxx> wrote:
>
> On 8/24/2026 11:41 PM, Omar Abuzaid wrote:
> > Qualcomm Atheros QCA9377 using ath10k_pci can cause a complete system
> > hard lock when resuming from deep/S3 suspend. During the failed
> > resume, the kernel log shows repeated PCIe AER Physical Layer and Data
> > Link Layer errors involving the QCA9377.
> >
> > Unloading ath10k_pci before suspend prevents the problem.
> >
> > System
> >
> > Fedora Linux 44
> >
> > Kernel:
> > 7.1.10-200.fc44.x86_64
> >
> > Architecture:
> > x86_64
> >
> > Kernel taint:
> > 0
> >
> > BIOS:
> > 1.32.0
> > 09/03/2024
> >
> > Suspend modes:
> > s2idle [deep]
> >
> > Wi-Fi device:
> > Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter [168c:0042] (rev 31)
> >
> > Subsystem:
> > Dell Device [1028:1810]
> >
> > Driver:
> > ath10k_pci
> >
> > Problem
> >
> > When the system resumes from deep/S3 suspend with ath10k_pci loaded,
> > the entire system can hard-freeze.
> >
> > When this happens:
> >
> > The system becomes completely unresponsive.
> > Caps Lock does not toggle.
> > Magic SysRq does not respond.
> > A forced power-off is required.
> >
> > The kernel log around resume contains repeated PCIe AER errors such as:
> >
> > ath10k_pci 0000:02:00.0: PCIe Bus Error: severity=Correctable,
> > type=Physical Layer, (Receiver ID)
> > ath10k_pci 0000:02:00.0: device [168c:0042] error status/mask=000000c1/00006000
> > ath10k_pci 0000:02:00.0: [ 0] RxErr (First)
> >
> > pcieport 0000:00:1c.7: AER: Multiple Correctable error message
> > received from 0000:02:00.0
> >
> > ath10k_pci 0000:02:00.0: PCIe Bus Error: severity=Correctable,
> > type=Data Link Layer, (Receiver ID)
> >
> > There are also ACPI errors during resume:
> >
> > ACPI BIOS Error (bug): Could not resolve symbol [_SB.PCI0.GLAN.GPEH],
> > AE_NOT_FOUND
> > ACPI Error: Aborting method _GPE._L6D due to previous error (AE_NOT_FOUND)
> > ACPI Error: AE_NOT_FOUND, while evaluating GPE method [_L6D]
> >
> > Steps to reproduce
> >
> > Boot normally with ath10k_pci loaded.
> > Confirm the QCA9377 is using ath10k_pci.
> > Suspend using deep/S3 suspend.
> > Wake the system.
> > The system may completely hard-lock during resume.
> >
> > Isolation test / workaround
> >
> > Before suspend:
> >
> > sudo modprobe -r ath10k_pci
> > systemctl suspend
> >
> > With ath10k_pci unloaded, the system resumes normally without the hard lock.
> >
> > After resume:
> >
> > sudo modprobe ath10k_pci
> >
> > The driver reloads and Wi-Fi reconnects normally.
> >
> > Simply unloading and reloading ath10k_pci without suspending also
> > works normally.
> >
> > PCIe information
> >
> > LnkCap: Speed 2.5GT/s, Width x1, ASPM L0s L1
> > LnkCtl: ASPM L0s L1 Enabled
> > LnkSta: Speed 2.5GT/s, Width x1
> >
> > L1 PM substates are enabled:
> >
> > PCI-PM_L1.2+
> > PCI-PM_L1.1+
> > ASPM_L1.2+
> > ASPM_L1.1+
> >
> > This appears to involve the QCA9377/ath10k PCIe resume or PCIe
> > power-management path, although I cannot determine whether the root
> > cause is ath10k, PCIe power management, device firmware, or system
> > ACPI firmware.
> >
> > I also filed this with Fedora as Bugzilla #2523243.
> >
> > I can provide the complete previous-boot kernel log and perform
> > additional tests if needed.
>
> Please see:
> https://wireless.docs.kernel.org/en/latest/en/users/drivers/ath11k/bugreport.html
>
> Although that is an ath11k link, the same guidance should be used for ath10k,
> substituting ath10k for ath11k where necessary. Having a Bugzilla record
> allows the issue to be assigned and tracked.