[Bug 221510] New: CalDigit TS5+ Thunderbolt rear USB controller fails to enumerate on AMD Strix Point USB4 host

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221510

            Bug ID: 221510
           Summary: CalDigit TS5+ Thunderbolt rear USB controller fails to
                    enumerate on AMD Strix Point USB4 host
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: bugzilla-kernel@andrewzah.com
        Regression: No

Created attachment 310101
  --> https://bugzilla.kernel.org/attachment.cgi?id=310101&action=edit
dmesg,lsusb,lspci,tbadm etc debug output

I have a webcam connected to the rear usb hub of the Caldigit TS5+ dock. It
fails to enumerate on linux, however it does light up and activate when plugged
in. It does work when connected via the front usb port, just not the rear ones.

However, it does work with an ASUS Zephyrus G14 (GA403UV, Ryzen 9 8945HS, Hawk
Point) running Windows. 

I did see this in the dmesg logs at one point while testing: "usb usb4: We
don't know the algorithms for LPM for this host, disabling LPM".

Kernels tested: 6.12.82 and 6.19.13 (NixOS 25.11) 

Hardware

* Laptop: Lenovo ThinkPad T14s Gen 6 AMD (21M1CTO1WW / 21M1CTO1WWUS1)
* CPU: AMD Ryzen AI 7 PRO 360 w/ Radeon 880M (Strix Point, Zen 5)
* Dock: CalDigit TS5 Plus

Steps to reproduce:

1. Boot Linux on a ThinkPad T14s Gen 6 AMD with the TS5 Plus connected via
Thunderbolt.
2. Plug a USB-C device (tested: Insta360 Link 2 webcam, idVendor 2e1a,
idProduct 4c04) into any of the three rear USB-C ports on the dock.
3. Observe: device receives power but does not enumerate. dmesg shows no
events. lsusb and v4l2-ctl don't list the device.

Expected behavior: Device enumerates and is usable, as it does when plugged
into the front USB-C port on the same dock.

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