Steam Deck: USB-C docking station USB hub devices not enumerating (USB3/xHCI regression)

[kivcetin]

Your system information

• Steam client version: 1766177208
• SteamOS version: 3.7.19 Build 20251124.1
• Opted into Steam client beta?: No
• Opted into SteamOS beta?: No
• Have you checked for updates in Settings > System?: Yes

Please describe your issue in as much detail as possible:

When connecting a USB-C docking station to the Steam Deck, HDMI output works as expected,
but USB hub devices (keyboard and mouse) do not enumerate or function.

Expected behavior:

• USB hub devices connected to the dock (keyboard, mouse) should be detected and work normally.

Actual behavior:

• HDMI output works correctly.
• USB hub devices (keyboard/mouse) do not work.
• Kernel logs show repeated resets of a SuperSpeed USB device using xhci-hcd.
• The dock is detected as a USB 3 hub, but enumeration does not complete successfully.

The same docking station works correctly on other devices (non–Steam Deck).

Steps for reproducing this issue:

1. Boot Steam Deck with SteamOS Stable.
2. Connect the USB-C docking station.
3. Connect a keyboard and mouse to the dock.
4. Observe that HDMI output works, but USB devices do not function.

Dock information

Dock model: Baseus GamerX 6 Ports USB-C Steam Deck Docking Station

Ports:

• USB-C (host)
• 3x USB 3.0
• HDMI
• Ethernet

lsusb output (dock connected)

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 28de:1205 Valve Software Steam Deck Controller
Bus 001 Device 003: ID 13d3:3553 IMC Networks Bluetooth Radio
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 004 Device 003: ID 05e3:0626 Genesys Logic, Inc. Hub
Bus 004 Device 004: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit Ethernet Adapter

Additional logs

Kernel version:
6.11.11-valve26-1-neptune

Relevant dmesg output:
[ 352.658281] r8152-cfgselector 4-1.1: reset SuperSpeed USB device number 4 using xhci-hcd

Additional notes

• Disabling USB autosuspend does not resolve the issue.
• Unbinding the r8152 driver does not resolve the issue.
• Using the kernel parameter usbcore.usb3_disable=1 does not disable USB3 for the dock.
• The issue appears related to USB3/xHCI handling with certain USB-C docks using
  Genesys Logic USB hubs and Realtek RTL8153 (r8152) Ethernet controllers.