[Bug 221379] New: xhci_hcd: USB ports intermittently disabled with "EMI?" on Intel Alder Lake-S PCH (Z690) with Genesys Logic hubs

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221379

            Bug ID: 221379
           Summary: xhci_hcd: USB ports intermittently disabled with
                    "EMI?" on Intel Alder Lake-S PCH (Z690) with Genesys
                    Logic hubs
           Product: Drivers
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: ingo@da-is.de
        Regression: No

USB devices connected to the Intel Alder Lake-S PCH xHCI controller
intermittently disconnect with the kernel message usb X-Y-portZ: disabled by
hub (EMI?), re-enabling... followed by device reconnect. The issue occurs after
periods of inactivity (approximately 5 minutes) and affects multiple USB
devices regardless of which physical port is used.
The problem is specific to Linux – the same hardware configuration works
without any issues under Windows 11, ruling out a hardware defect.
Kernel version: 6.19.12-200.fc43.x86_64
Distribution: Fedora 43
Hardware:

Mainboard: Gigabyte Technology Co., Ltd. Z690 UD DDR4
CPU: Intel Core i9-14900KF
USB Controller: Intel Corporation Alder Lake-S PCH USB 3.2 Gen 2x2 xHCI
Controller (rev 11), PCI ID 0000:00:14.0
xHCI quirks: 0x0000000200009810

Affected devices (connected via Genesys Logic hubs):

Thrustmaster TWCS Throttle (044f:b687)
Logitech PRO X RAPID keyboard (046d:c35b)
Elgato Stream Deck MK.2 (0fd9:0080)

Not affected: Devices connected to Renesas uPD720201 USB 3.0 Host Controller
(08:00.0) work without any issues.
Steps to reproduce:

Connect USB devices via Genesys Logic hubs (05e3:0608 or 05e3:0610) to the
Intel Alder Lake-S PCH xHCI controller
Leave system idle for approximately 5 minutes
Return to system – USB devices disconnect and reconnect

Expected behavior: USB devices remain stable during and after idle periods.
Actual behavior:
usb X-Y-portZ: disabled by hub (EMI?), re-enabling...
usb X-Y.Z: USB disconnect, device number N
usb X-Y.Z: new full-speed USB device number M using xhci_hcd
Workaround: Moving affected devices to a Renesas uPD720201 PCIe USB controller
resolves the issue completely.
Additional notes:

Problem occurs with both onboard Genesys Logic hubs and external Genesys Logic
hubs
Problem also occurred with a separate PCIe USB card (different controller) when
Genesys Logic hubs were involved
All software-based fixes attempted (USB autosuspend disabled, PCI power
management disabled, C-states checked) had no effect
Windows 11 on the same hardware shows no USB instability

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