Merci pour ce retour,
la seule présence de usbfs est :
0.113168] pci 0000:00:02.0: vgaarb: bridge control possible
[ 0.113168] vgaarb: loaded
[ 0.113168] ACPI: bus type USB registered
[ 0.113168] usbcore: registered new interface driver[b] usbfs[/b]
[ 0.113168] usbcore: registered new interface driver hub
[ 0.113168] usbcore: registered new device driver usb
[ 0.113168] EDAC MC: Ver: 3.0.0