I get some warnings at boot on all kernels I've tried. On 4.5-rc4, I see:
[ 0.229429] usbcore: registered new interface driver usbfs
[ 0.229436] usbcore: registered new interface driver hub
[ 0.229451] usbcore: registered new device driver usb
[ 1.057998] xhci_hcd 0000:00:14.0: xHCI Host Controller
[ 1.058640] xhci_hcd 0000:00:14.0: new USB bus registered, assigned
bus number 1
[ 1.059811] xhci_hcd 0000:00:14.0: hcc params 0x200077c1 hci
version 0x100 quirks 0x00109810
[ 1.059818] xhci_hcd 0000:00:14.0: cache line size of 64 is not supported
[ 1.059821] xhci_hcd 0000:00:14.0: supports USB remote wakeup
[ 1.060480] usb usb1: default language 0x0409
[ 1.060584] usb usb1: udev 1, busnum 1, minor = 0
[ 1.060587] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 1.060589] usb usb1: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[ 1.060590] usb usb1: Product: xHCI Host Controller
[ 1.060592] usb usb1: Manufacturer: Linux 4.5.0-rc4-acpi+ xhci-hcd
[ 1.060593] usb usb1: SerialNumber: 0000:00:14.0
[ 1.060845] usb usb1: usb_probe_device
[ 1.060848] usb usb1: configuration #1 chosen from 1 choice
[ 1.060914] usb usb1: adding 1-0:1.0 (config #1, interface 0)
[ 1.060937] hub 1-0:1.0: usb_probe_interface
[ 1.060939] hub 1-0:1.0: usb_probe_interface - got id
[ 1.060941] hub 1-0:1.0: USB hub found
[ 1.061028] hub 1-0:1.0: 12 ports detected
[ 1.061030] hub 1-0:1.0: standalone hub
[ 1.061031] hub 1-0:1.0: no power switching (usb 1.0)
[ 1.061032] hub 1-0:1.0: individual port over-current protection
[ 1.061034] hub 1-0:1.0: Single TT
[ 1.061035] hub 1-0:1.0: TT requires at most 8 FS bit times (666 ns)
[ 1.061036] hub 1-0:1.0: power on to power good time: 20ms
[ 1.061109] hub 1-0:1.0: local power source is good
[ 1.084337] usb usb1-port3: DeviceRemovable is changed to 1
according to platform information.
[ 1.084339] usb usb1-port4: DeviceRemovable is changed to 1
according to platform information.
[ 1.084341] usb usb1-port5: DeviceRemovable is changed to 1
according to platform information.
[ 1.084343] hub 1-0:1.0: trying to enable port power on non-switchable hub
[ 1.084438] xhci_hcd 0000:00:14.0: xHCI Host Controller
[ 1.084624] xhci_hcd 0000:00:14.0: new USB bus registered, assigned
bus number 2
[ 1.084628] xhci_hcd 0000:00:14.0: supports USB remote wakeup
[ 1.084671] usb usb2: skipped 1 descriptor after endpoint
[ 1.084679] usb usb2: default language 0x0409
[ 1.084691] usb usb2: udev 1, busnum 2, minor = 128
[ 1.084693] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003
[ 1.084694] usb usb2: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[ 1.084695] usb usb2: Product: xHCI Host Controller
[ 1.084697] usb usb2: Manufacturer: Linux 4.5.0-rc4-acpi+ xhci-hcd
[ 1.084698] usb usb2: SerialNumber: 0000:00:14.0
[ 1.084909] usb usb2: usb_probe_device
[ 1.084914] usb usb2: configuration #1 chosen from 1 choice
[ 1.084926] usb usb2: adding 2-0:1.0 (config #1, interface 0)
[ 1.084948] hub 2-0:1.0: usb_probe_interface
[ 1.084949] hub 2-0:1.0: usb_probe_interface - got id
[ 1.084952] hub 2-0:1.0: USB hub found
[ 1.084966] hub 2-0:1.0: 6 ports detected
[ 1.084968] hub 2-0:1.0: standalone hub
[ 1.084969] hub 2-0:1.0: no power switching (usb 1.0)
[ 1.084971] hub 2-0:1.0: individual port over-current protection
[ 1.084972] hub 2-0:1.0: TT requires at most 8 FS bit times (666 ns)
[ 1.084973] hub 2-0:1.0: power on to power good time: 20ms
[ 1.084978] hub 2-0:1.0: local power source is good
[ 1.085684] usb usb2-port1: peered to usb1-port1
[ 1.086356] usb usb2-port2: peered to usb1-port2
[ 1.087004] usb usb2-port3: peered to usb1-port6
[ 1.087713] usb: failed to peer usb2-port4 and usb1-port6 by
location (usb2-port4:none) (usb1-port6:usb2-port3)
[ 1.087715] usb usb2-port4: failed to peer to usb1-port6 (-16)
[ 1.087716] usb: port power management may be unreliable
[ 1.088377] usb: failed to peer usb2-port5 and usb1-port6 by
location (usb2-port5:none) (usb1-port6:usb2-port3)
[ 1.088379] usb usb2-port5: failed to peer to usb1-port6 (-16)
[ 1.089017] usb: failed to peer usb2-port6 and usb1-port6 by
location (usb2-port6:none) (usb1-port6:usb2-port3)
[ 1.089018] usb usb2-port6: failed to peer to usb1-port6 (-16)
[ 1.089028] hub 2-0:1.0: trying to enable port power on non-switchable hub
[ 1.089164] usbcore: registered new interface driver usbserial
[ 1.089170] usbcore: registered new interface driver usbserial_generic
[ 1.089195] usbserial: USB Serial support registered for generic
[ 1.097055] usbcore: registered new interface driver usbhid
[ 1.097056] usbhid: USB HID core driver
[ 1.184226] usb usb1-port3: status 0101 change 0001
[ 1.184241] usb usb1-port5: status 0101 change 0001
[ 1.284270] hub 1-0:1.0: state 7 ports 12 chg 0028 evt 0000
[ 1.284302] usb usb1-port3: status 0101, change 0000, 12 Mb/s
[ 1.288262] hub 2-0:1.0: state 7 ports 6 chg 0000 evt 0000
[ 1.288342] hub 2-0:1.0: hub_suspend
[ 1.288348] usb usb2: bus auto-suspend, wakeup 1
[ 1.335334] usb usb1-port3: not reset yet, waiting 50ms
[ 1.437396] usb 1-3: new full-speed USB device number 2 using xhci_hcd
[ 1.488359] usb usb1-port3: not reset yet, waiting 50ms
[ 1.603782] usb 1-3: udev 2, busnum 1, minor = 1
[ 1.603791] usb 1-3: New USB device found, idVendor=8087, idProduct=0a2a
[ 1.603796] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 1.604042] usb 1-3: usb_probe_device
[ 1.604048] usb 1-3: configuration #1 chosen from 1 choice
[ 1.604540] usb 1-3: adding 1-3:1.0 (config #1, interface 0)
[ 1.604812] usb 1-3: adding 1-3:1.1 (config #1, interface 1)
[ 1.605058] usb usb1-port5: status 0101, change 0000, 12 Mb/s
[ 1.655297] usb usb1-port5: not reset yet, waiting 50ms
[ 1.757276] usb 1-5: new high-speed USB device number 3 using xhci_hcd
[ 1.808265] usb usb1-port5: not reset yet, waiting 50ms
[ 1.956444] usb 1-5: skipped 2 descriptors after configuration
[ 1.956447] usb 1-5: skipped 6 descriptors after interface
[ 1.956449] usb 1-5: skipped 1 descriptor after endpoint
[ 1.956451] usb 1-5: skipped 17 descriptors after endpoint
[ 1.958099] usb 1-5: default language 0x0409
[ 1.963384] usb 1-5: udev 3, busnum 1, minor = 2
[ 1.963386] usb 1-5: New USB device found, idVendor=0bda, idProduct=5682
[ 1.963388] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 1.963390] usb 1-5: Product: Integrated_Webcam_HD
[ 1.963391] usb 1-5: Manufacturer: CKFEH41I373010075512
[ 1.963392] usb 1-5: SerialNumber: 200901010001
[ 1.963630] usb 1-5: usb_probe_device
[ 1.963632] usb 1-5: configuration #1 chosen from 1 choice
[ 1.966973] usb 1-5: adding 1-5:1.0 (config #1, interface 0)
[ 1.968683] usb 1-5: adding 1-5:1.1 (config #1, interface 1)
[ 16.644924] btusb 1-3:1.0: usb_probe_interface
[ 16.644938] btusb 1-3:1.0: usb_probe_interface - got id
[ 16.651022] usbcore: registered new interface driver btusb
[ 16.806790] uvcvideo 1-5:1.0: usb_probe_interface
[ 16.806795] uvcvideo 1-5:1.0: usb_probe_interface - got id
[ 16.832330] input: Integrated_Webcam_HD as
/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/input/input11
[ 16.832603] usbcore: registered new interface driver uvcvideo
[ 18.864591] usb 1-5: usb auto-suspend, wakeup 0
I don't know whether this is useful:
$ sudo lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
|__ Port 3: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M
|__ Port 3: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M
|__ Port 5: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 5: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
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