grazie mille per la diaponibilità

comando : lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 05e1:0501 Syntek Semiconductor Co., Ltd DC-1125 Webcam
Bus 003 Device 007: ID 4348:5584 WinChipHead CH34x printer adapter cable
Bus 003 Device 005: ID 04f3:0217 Elan Microelectronics Corp.
Bus 004 Device 002: ID 0b05:1712 ASUSTek Computer, Inc. BT-183 Bluetooth 2.0+EDR adapter
comando : dmesg | grep usb
[ 0.523050] usbcore: registered new interface driver usbfs
[ 0.523050] usbcore: registered new interface driver hub
[ 0.523050] usbcore: registered new device driver usb
[ 1.644130] usb 1-8: new high speed USB device number 5 using ehci_hcd
[ 2.016066] usb 3-1: new full speed USB device number 2 using uhci_hcd
[ 2.408054] usb 3-2: new low speed USB device number 3 using uhci_hcd
[ 2.816079] usb 4-1: new full speed USB device number 2 using uhci_hcd
[ 9.614865] usbcore: registered new interface driver btusb
[ 9.917659] usbcore: registered new interface driver stkwebcam
[ 10.097585] input: USB Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/input/input8
[ 10.097738] generic-usb 0003:04F3:0217.0001: input,hidraw0: USB HID v1.11 Mouse [USB Mouse] on usb-0000:00:1d.1-2/input0
[ 10.097769] usbcore: registered new interface driver usbhid
[ 10.097771] usbhid: USB HID core driver
[ 116.216106] usb 3-2: USB disconnect, device number 3
[ 118.448124] usb 3-1: USB disconnect, device number 2
[ 120.328075] usb 3-1: new full speed USB device number 4 using uhci_hcd
[ 121.664054] usb 3-2: new low speed USB device number 5 using uhci_hcd
[ 121.848243] input: USB Mouse as /devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/input/input9
[ 121.848488] generic-usb 0003:04F3:0217.0002: input,hidraw0: USB HID v1.11 Mouse [USB Mouse] on usb-0000:00:1d.1-2/input0
[ 2284.000171] usb 3-1: USB disconnect, device number 4
[ 2290.444094] usb 2-2: new full speed USB device number 2 using uhci_hcd
[ 2290.678114] usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd mtp-probe rqt 128 rq 6 len 1024 ret -71
[ 3119.760128] usb 2-2: USB disconnect, device number 2
[ 3420.596055] usb 3-1: new full speed USB device number 6 using uhci_hcd
[ 7761.116187] usb 3-1: USB disconnect, device number 6
[ 7761.356093] usb 3-1: new full speed USB device number 7 using uhci_hcd