Re: [REGRESSION] Intel Wireless adapter is not detected until suspending to RAM and resuming

[Lukas Wunner <lukas@wunner.de>]

On Mon, Oct 20, 2025 at 06:25:10PM -0500, Bjorn Helgaas wrote:
>   [    0.113379] pci 0000:00:1c.0: [8086:9d10] type 01 class 0x060400 PCIe Root Port
>   [    0.113403] pci 0000:00:1c.0: PCI bridge to [bus 01]
>   [    0.113409] pci 0000:00:1c.0:   bridge window [mem 0x91000000-0x910fffff]
>   [    0.115692] pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 PCIe Endpoint
>   [    0.115830] pci 0000:01:00.0: BAR 0 [mem 0x91000000-0x91001fff 64bit]
>   [    0.196539] pcieport 0000:00:1c.0: pciehp: Slot #0 AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+ Interlock- NoCompl+ IbPresDis- LLActRep+
>   [    0.196802] pcieport 0000:00:1c.0: pciehp: Slot(0): Card not present
>   [    0.196925] pcieport 0000:00:1c.0: pciehp: Slot(0): Card present
>   [    0.196927] pcieport 0000:00:1c.0: pciehp: Slot(0): Link Up
>   [    1.400127] pcieport 0000:00:1c.0: pciehp: Slot(0): No device found

Does this flap of the Presence Detect State bit also happen with
4d4c10f763d7?  AFAICS, no dmesg output has been provided yet for
the working case.  It would also be good to have debug output enabled,
i.e. set CONFIG_DYNAMIC_DEBUG=y and add this to the command line:

  pciehp.pciehp_debug=1 dyndbg="file drivers/pci/* +p"

Does it help if in drivers/pci/hotplug/pciehp_hpc.c:pci_bus_check_dev(),
the "delay" is initialized to a higher value, say, 5000 instead of 1000?

Thanks,

Lukas