lsmod | grep xhci_hcd

->> nothing. not loaded?

dmegs | hcd
[    0.820408] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.833898] usb usb1: Manufacturer: Linux 3.13.0-21-generic ehci_hcd
[    0.849931] usb usb2: Manufacturer: Linux 3.13.0-21-generic ehci_hcd
[    0.850138] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.850147] uhci_hcd: USB Universal Host Controller Interface driver
[    0.850210] xhci_hcd 0000:00:14.0: xHCI Host Controller
[    0.850212] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 3
[    0.850286] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
[    0.850300] xhci_hcd 0000:00:14.0: irq 42 for MSI/MSI-X
[    0.850367] usb usb3: Manufacturer: Linux 3.13.0-21-generic xhci_hcd
[    0.851860] xhci_hcd 0000:00:14.0: xHCI Host Controller
[    0.851862] xhci_hcd 0000:00:14.0: new USB bus registered, assigned bus number 4
[    0.851892] usb usb4: Manufacturer: Linux 3.13.0-21-generic xhci_hcd
[    1.698105] usb 3-5: new low-speed USB device number 2 using xhci_hcd
[    1.834163] usb 3-6: new low-speed USB device number 3 using xhci_hcd





lspci -nnk | grep "USB controller" -A2
00:14.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI [8086:8c31] (rev 05)
	Subsystem: Gigabyte Technology Co., Ltd Device [1458:5007]
	Kernel driver in use: xhci_hcd
--
00:1a.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 [8086:8c2d] (rev 05)
	Subsystem: Gigabyte Technology Co., Ltd Device [1458:5006]
	Kernel driver in use: ehci-pci
--
00:1d.0 USB controller [0c03]: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 [8086:8c26] (rev 05)
	Subsystem: Gigabyte Technology Co., Ltd Device [1458:5006]
	Kernel driver in use: ehci-pci