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# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
|__ Port 4: Dev 13, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
|__ Port 6: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 6: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 7: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 7: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
# grep -i xhci /boot/config-4.9.0-3-amd64
CONFIG_USB_XHCI_HCD=m
CONFIG_USB_XHCI_PCI=m
# CONFIG_USB_XHCI_PLATFORM is not set
# lspci -v | grep xhci
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci