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From: bugzilla-daemon@kernel.org
To: linux-usb@vger.kernel.org
Subject: [Bug 220686] New: REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports
Date: Sun, 19 Oct 2025 18:54:30 +0000	[thread overview]
Message-ID: <bug-220686-208809@https.bugzilla.kernel.org/> (raw)

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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             reply	other threads:[~2025-10-19 18:54 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-19 18:54 bugzilla-daemon [this message]
2025-10-19 21:27 ` [Bug 220686] REGRESSION: USB devices not recognised when plugged to Thunderbolt 4 USB-C ports bugzilla-daemon
2025-10-20  4:33 ` bugzilla-daemon
2025-10-20  6:45 ` bugzilla-daemon
2025-10-20 17:58 ` bugzilla-daemon
2025-12-01  8:35 ` bugzilla-daemon
2025-12-01  8:36 ` bugzilla-daemon
2025-12-01  9:25 ` bugzilla-daemon
2025-12-11 12:00 ` bugzilla-daemon

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