From: Thorsten Leemhuis <email@example.com>
To: "Rafael J. Wysocki" <firstname.lastname@example.org>
Cc: "email@example.com" <firstname.lastname@example.org>,
Linux Kernel Mailing List <email@example.com>,
Linux PM <firstname.lastname@example.org>,
Luca Coelho <email@example.com>,
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: <firstname.lastname@example.org> (raw)
Hi, this is your Linux kernel regression tracker.
Rafael, I noticed a regression report in bugzilla.kernel.org 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 <email@example.com>
#regzbot title: pci/iwlwifi: wifi is not working due to PCI power state
#regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215715
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:
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CC the regression list and tell regzbot about the issue, as that ensures
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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
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next 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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