Comment 2 for bug 764368

lsusb -v

Bus 001 Device 002: ID 1a4e:7021
Device Descriptor:
  bLength 18
  bDescriptorType 1
  bcdUSB 2.00
  bDeviceClass 0 (Defined at Interface level)
  bDeviceSubClass 0
  bDeviceProtocol 0
  bMaxPacketSize0 64
  idVendor 0x1a4e
  idProduct 0x7021
  bcdDevice 1.00
  iManufacturer 1 INFRASONIC
  iProduct 2 AMON
  iSerial 3 no serial number
  bNumConfigurations 1
  Configuration Descriptor:
    bLength 9
    bDescriptorType 2
    wTotalLength 72
    bNumInterfaces 2
    bConfigurationValue 1
    iConfiguration 0
    bmAttributes 0x80
      (Bus Powered)
    MaxPower 480mA
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 0
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 0
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 1
      bAlternateSetting 0
      bNumEndpoints 0
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 0
    Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 1
      bAlternateSetting 1
      bNumEndpoints 4
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 0
      Endpoint Descriptor:
        bLength 9
        bDescriptorType 5
        bEndpointAddress 0x81 EP 1 IN
        bmAttributes 5
          Transfer Type Isochronous
          Synch Type Asynchronous
          Usage Type Data
        wMaxPacketSize 0x004e 1x 78 bytes
        bInterval 1
        bRefresh 0
        bSynchAddress 0
      Endpoint Descriptor:
        bLength 9
        bDescriptorType 5
        bEndpointAddress 0x02 EP 2 OUT
        bmAttributes 5
          Transfer Type Isochronous
          Synch Type Asynchronous
          Usage Type Data
        wMaxPacketSize 0x004e 1x 78 bytes
        bInterval 1
        bRefresh 0
        bSynchAddress 0
      Endpoint Descriptor:
        bLength 9
        bDescriptorType 5
        bEndpointAddress 0x83 EP 3 IN
        bmAttributes 3
          Transfer Type Interrupt
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0200 1x 512 bytes
        bInterval 4
        bRefresh 0
        bSynchAddress 0
      Endpoint Descriptor:
        bLength 9
        bDescriptorType 5
        bEndpointAddress 0x04 EP 4 OUT
        bmAttributes 2
          Transfer Type Bulk
          Synch Type None
          Usage Type Data
        wMaxPacketSize 0x0200 1x 512 bytes
        bInterval 4
        bRefresh 0
        bSynchAddress 0