problem with USB ports

[Thibaud Hulin <hulin.thibaud@wanadoo.fr>]

Hello !
I'm trying to use a dongle with ndiswrapper, but it fails because a 
problem of usb. Indeed, when I put on the dongle, a lsusb give :
Bus 001 Device 002: ID 0457:0163 Silicon Integrated Systems Corps.
Bus 001 Device 001: ID 0000:0000
But, I have just one usb port on my portable !
Two devices on the same port ?
So, 30 seconds later, the dongle is not recognize. lsusb give :
Bus 001 Device 001: ID 0000:0000
So, I can't use my dongle.
Thanks for help !
Thibaud.