As DougieLawson requested, I redid both lsusb and lsusb -t in pidora:
[
[email protected] ~]# lsusb
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. LAN9500 Ethernet 10/100 Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 0424:2517 Standard Microsystems Corp. Hub
Bus 001 Device 005: ID 22b8:0938 Motorola PCS
Bus 001 Device 006: ID 1241:0003 Belkin
[
[email protected] ~]# lsusb -t
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 480M
|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M
|__ Port 2: Dev 4, If 0, Class=Hub, Driver=hub/7p, 480M
|__ Port 1: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 3: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 3: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
FTrevorGowen wrote: "entries for devices 4,5 & 6 refer to other USB devices plugged in to the Pi's 3-port hub (1 port is used for the LAN/Ethernet)."
Device 2 is Standard Microsystem (SMC)'s LAN/Ethernet). Why is SMC also listed for device 3 and device 4?
FTrevorGowen, where do you interpret 7 port hubs? From "driver=hub/7p?
Which device would the 7 port hub? Device 4 Standard Microsystems, device 5 Motorola PCS (Atrix lapdock) or device 6 Belkin? Phill Rymer, thanks for recommending searching for linux USB ID codes.
http://www.linux-usb.org/usb.ids lists Belkin 1241 but not the rest of Belkin's ID number which is 0003.1241 lists keyboards and mice so Belkin 1241:0003 is either the lapdock's keyboard or mouse. Thank you Phill for solving the mystery of what device Belkin is in the lapdock.
Pursuant to linux-usb.org/usb.ids:
Standard Microsystem 0424:9512 is "SMC9512/9514 USB Hub"
Standard Microsystems 0424:ec00 is "SMSC9512/9514 Fast Ethernet Adapter"
Standard Microsystems 0424:2517 is a hub.
Why is the third Standard Microsystem on device 4 which according to FTrevorGowen refers to other USB devices plugged in to the Pi's 3-port USB hub? I don't think other owners of Model B, rev2 have three Standard Microsystem in their lsusb? I don't think they have the third Standard Microsystems 0424:2517 hub at device 4.