i link vedo che non funzionano o?
poi controllando quando dici mi esce questo
root@dm900:~# lsusb
Bus 004 Device 002: ID 07ca:a867
Bus 001 Device 001: ID 1d6b:0002
Bus 002 Device 001: ID 1d6b:0003
Bus 003 Device 001: ID 1d6b:0002
Bus 004 Device 001: ID 1d6b:0002
Bus 005 Device 001: ID 1d6b:0001
Bus 006 Device 001: ID 1d6b:0001