[Bug 220686] New: REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[Bug 220686] New: REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[bugzilla-daemon]

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: drivers_usb@kernel-bugs.kernel.org
          Reporter: anonq@tutanota.com
        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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[Bug 220686] REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[bugzilla-daemon]

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

Michał Pecio (michal.pecio@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |michal.pecio@gmail.com

--- Comment #1 from Michał Pecio (michal.pecio@gmail.com) ---
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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[Bug 220686] REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[bugzilla-daemon]

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

--- Comment #2 from anonq@tutanota.com ---
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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[Bug 220686] REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[bugzilla-daemon]

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

--- Comment #3 from Michał Pecio (michal.pecio@gmail.com) ---
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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[Bug 220686] REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports

[bugzilla-daemon]

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

Kenneth R. Crudup (kenny@panix.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kenny@panix.com

--- Comment #4 from Kenneth R. Crudup (kenny@panix.com) ---
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/tencent_8C54420E1B0FF8D804C1B4651DF970716309@qq.com/

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