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From: Thorsten Leemhuis <>
To: "Rafael J. Wysocki" <>
Cc: "" <>,
	Linux Kernel Mailing List <>,
	Linux PM <>,
	Luca Coelho <>,
	"" <>
Subject: Bug 215715 - PCI device (iwlwifi) is not working due to PCI power state change issues
Date: Mon, 28 Mar 2022 15:33:25 +0200	[thread overview]
Message-ID: <> (raw)

Hi, this is your Linux kernel regression tracker.

Rafael, I noticed a regression report in that afaics
nobody acted upon since it was reported about a week ago, that's why I
decided to forward it to the lists, maintainers, and the author of the
culprit. To quote from :

>  Stefan Gottwald 2022-03-21 13:31:43 UTC
> Created attachment 300589 [details]
> dmesg output from error case
> We got a Elo AIO i2 device which most current BIOS where WiFi was working with Kernel 5.12.x but stopped working since Kernel 5.13.19 and newer (5.17.0-rc5).
> The kernel error message is:
> [    3.419766] iwlwifi 0000:01:00.0: can't change power state from D3cold to D0 (config space inaccessible)
> [    3.419781] iwlwifi 0000:01:00.0: can't change power state from D3cold to D0 (config space inaccessible)
> [    3.419975] iwlwifi 0000:01:00.0: HW_REV=0xFFFFFFFF, PCI issues?
> [    3.420911] iwlwifi: probe of 0000:01:00.0 failed with error -5
> The issue can be solved by adding the iwlwifi driver to the initramfs so it is loaded much earlier and seems to work.
> To narrow down the issue I did an git bisect between v5.13.18 and v5.13.19 mainline kernel version which got me to following commit which if reverted fix the issue on this device.
> Reverting commit d0660d8ab123ea471064f0828f290bec9593e16b : PCI: Use pci_update_current_state() in pci_enable_device_flags()

FWIW, that afaics is d0660d8ab123 ("PCI: Use pci_update_current_state()
in pci_enable_device_flags()") in mainline.

> resolve the issue also in the newer kernels. Seems like the function platform_pci_get_power_state is always returning PCI_D3cold on this device also if this is not true.

Could somebody take a look into this? Or was this discussed somewhere
else already? Or even fixed?

Anyway, to get this tracked:

#regzbot introduced: d0660d8ab123ea471064f0828f290bec9593e16b
#regzbot from: Stefan Gottwald <>
#regzbot title: pci/iwlwifi: wifi is not working due to PCI power state
change issues
#regzbot link:

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I'm getting a lot of
reports on my table. I can only look briefly into most of them and lack
knowledge about most of the areas they concern. I thus unfortunately
will sometimes get things wrong or miss something important. I hope
that's not the case here; if you think it is, don't hesitate to tell me
in a public reply, it's in everyone's interest to set the public record

Additional information about regzbot:

If you want to know more about regzbot, check out its web-interface, the
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The last two documents will explain how you can interact with regzbot
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Hint for reporters: when reporting a regression it's in your interest to
CC the regression list and tell regzbot about the issue, as that ensures
the regression makes it onto the radar of the Linux kernel's regression
tracker -- that's in your interest, as it ensures your report won't fall
through the cracks unnoticed.

Hint for developers: you normally don't need to care about regzbot once
it's involved. Fix the issue as you normally would, just remember to
include 'Link:' tag in the patch descriptions pointing to all reports
about the issue. This has been expected from developers even before
regzbot showed up for reasons explained in
'Documentation/process/submitting-patches.rst' and

             reply	other threads:[~2022-03-28 13:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-28 13:33 Thorsten Leemhuis [this message]
2022-03-29  8:49 ` Bug 215715 - PCI device (iwlwifi) is not working due to PCI power state change issues Thorsten Leemhuis
2022-03-31 19:14   ` Rafael J. Wysocki

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