Hi there,
Can you post the results of
" find /dev/bus/"
thnx,
GL 
PJ
also
lsusb -v | grep -i bcdusb
Output:
bcdUSB 1.10
bcdUSB 2.00
bcdUSB 2.00
bcdUSB 2.00
Depending on the version, the speed varies. Below table give you clear idea about the speeds associated with these versions.
USB 1.10 12Mb/s
USB 2.00 480Mb/s
USB 3.00 5Gb/s
Find USB device supported speeds by using tree structure option
lsusb -t
Otuput:
2-1.1:1.1: No such file or directory
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
|__ Port 1: Dev 6, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 1: Dev 6, If 1, Class=vend., Driver=, 480M
|__ Port 2: Dev 7, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 3: Dev 5, If 0, Class=stor., Driver=usb-storage, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
|__ Port 3: Dev 3, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M
|__ Port 3: Dev 3, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M
|__ Port 4: Dev 7, If 0, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
|__ Port 4: Dev 7, If 1, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M