New: REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

https://bugzilla.kernel.org/show_bug.cgi?id=220686

            Bug ID: 220686
           Summary: REGRESSION: USB devices not recognised when plugged to
                    Thunderbolt 4 USB-C ports
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.16.12
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: blocking
          Priority: P3
         Component: USB
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: Yes

I'm on Linux (Fedora 42)
Kernel 6.14.0-63.fc42.x86_64

USB controllers are detected:

$ lspci -nn | grep -i thunderbolt

00:07.0 PCI bridge [0604]: Intel Corporation Meteor Lake-P Thunderbolt 4 PCI Express Root Port #0 [8086:7ec4] (rev 10)
00:07.2 PCI bridge [0604]: Intel Corporation Meteor Lake-P Thunderbolt 4 PCI Express Root Port #2 [8086:7ec6] (rev 10)
00:0d.0 USB controller [0c03]: Intel Corporation Meteor Lake-P Thunderbolt 4 USB Controller [8086:7ec0] (rev 10)
00:0d.2 USB controller [0c03]: Intel Corporation Meteor Lake-P Thunderbolt 4 NHI #0 [8086:7ec2] (rev 10)
00:0d.3 USB controller [0c03]: Intel Corporation Meteor Lake-P Thunderbolt 4 NHI #1 [8086:7ec3] (rev 10)

All firmware is up-to-date, so is Fedora Linux

When I plug a device in the USB4 port, dmesg doesn't change and the device isn't detected at all

Booting from kernel 6.14.0-63.fc42.x86_64 works fine

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Michał Pecio ([email protected]) changed:

What |Removed |Added
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CC| |[email protected]

--- Comment #1 from Michał Pecio ([email protected]) --- Not sure which kernel version is broken? You listed 6.14.0-63.fc42 twice.

6.14 series is long obsolete, if Fedora still maintains it and screwed up on -63 revision, that's on them. We don't even know what patches they ship.

If your problem is with upstream 6.16, that's frankly obsolete too, but at least well known to anyone here.

Can you double check and specify clearly all known good and bad versions?

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--- Comment #2 from [email protected] ---
Thanks for clarifying; since I switching from obsolete kernels, I will pin the 6.14.0-63 one for now in my Fedora

The correct versions (fedora kernels):

6.14.0-63.fc42.x86_64 -> WORKS
6.16.12-200.fc42.x86_64 -> BROKEN

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--- Comment #3 from Michał Pecio ([email protected]) --- If you run 'lsusb', do you see fewer USB buses on the broken version?

Are you able to build and test upstream kernels from source, or work with Fedora to nail down which change caused it on their kernels?

Sometimes distribution regressions aren't even caused by code changes, but by changes to distribution's kernel config.

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Kenneth R. Crudup ([email protected]) changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #4 from Kenneth R. Crudup ([email protected]) --- This was indeed a regression in the kernel, but it's been since fixed and headed for upstream (if it hasn't already been applied):
https://lore.kernel.org/all/[email protected]/

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--- Comment #5 from [email protected] ---
How can I check if the patch has been applied?

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--- Comment #6 from [email protected] ---
The latest Fedora Kernel I can get is 6.17.8-200.fc42.x86_64 and the problem still persists

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--- Comment #7 from Michał Pecio ([email protected]) --- This commit seems irrelevant, it claims to fix a bug introduced in 6.18-rc1.

Can you post "lspci |grep USB" and "lsusb" from good and bad kernel, without making any changes to connected USB and thunderbolt devices?

And if you don't know how to build kernels from source, can you at least get other Fedora kernel packages (like 6.15 series) and see when was the bug introduced?

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[email protected] changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
         Resolution|---                         |UNREPRODUCIBLE

--- Comment #8 from [email protected] ---
I cannot reproduce the problem anymore in the latest Fedora kernels
* 6.17.9-200.fc42
* 6.17.10-200.fc42

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