ah, può servire un "dmesg | grep usb" ?
codice:
usbcore: registered new driver usbfs
usbcore: registered new driver hub
[<c02f3bc0>] (usb_hcd_irq+0x0/0x70)
usbcore: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.23:USB Abstract Control Model driver for USB modems and ISDN adapters
usbcore: registered new driver usblp
drivers/usb/class/usblp.c: v0.13: USB Printer Device Class driver
usbcore: registered new driver usb-storage
usbcore: registered new driver hiddev
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
usb 1-1: new low speed USB device using address 2
usb 1-1: control timeout on ep0out
usb 1-1: control timeout on ep0out
usb 1-1: device not accepting address 2, error -110
usb 1-1: new low speed USB device using address 3
usb 1-1: control timeout on ep0out
usb 1-1: control timeout on ep0out
usb 1-1: device not accepting address 3, error -110
usb 1-2: new low speed USB device using address 4
usb 1-2: control timeout on ep0out
usb 1-2: control timeout on ep0out
usb 1-2: device not accepting address 4, error -110
usb 1-2: new low speed USB device using address 5
usb 1-2: control timeout on ep0out
usb 1-2: control timeout on ep0out
usb 1-2: device not accepting address 5, error -110
usb 2-2: new full speed USB device using address 2
usb 2-2: control timeout on ep0out
usb 2-2: control timeout on ep0out
usb 2-2: device not accepting address 2, error -110
usb 2-2: new full speed USB device using address 3
usb 2-2: control timeout on ep0out
usb 2-2: control timeout on ep0out
usb 2-2: device not accepting address 3, error -110