XPost: linux.debian.bugs.dist, linux.kernel   
   From: sam.halliday@gmail.com   
      
   Hi Ben,   
      
   In answer to your logging request, this is the output after running   
      
   echo 'file drivers/hid/usbhid/hid-core.c +p' | sudo tee   
   /sys/kernel/debug/dynamic_debug/control   
      
   and plugging in the device (with the debian kernel, not my patched one)   
      
   [  371.897694] usb 1-2: new full-speed USB device number 8 using xhci_hcd   
   [  372.036133] usb 1-2: New USB device found, idVendor=03c3,   
   idProduct=1f01, bcdDevice= 0.00   
   [  372.036145] usb 1-2: New USB device strings: Mfr=1, Product=2,   
   SerialNumber=0   
   [  372.036149] usb 1-2: Product: ZWO EFW   
   [  372.036152] usb 1-2: Manufacturer: ZW0   
   [  372.043375] drivers/hid/usbhid/hid-core.c: HID probe called for ifnum 0   
   [  372.043404] drivers/hid/usbhid/hid-core.c: hid descriptor invalid,   
   bLen=9 bNum=2   
   [  372.043409] usbhid 1-2:1.0: can't add hid device: -22   
   [  372.043422] usbhid 1-2:1.0: probe with driver usbhid failed with error   
   -22   
      
   Also here is a more detailed lsusb output   
      
      
   Bus 001 Device 008: ID 03c3:1f01 ZWO ZWO EFW   
   Negotiated speed: Full Speed (12Mbps)   
   Device Descriptor:   
     bLength                18   
     bDescriptorType         1   
     bcdUSB               1.10   
     bDeviceClass            0 [unknown]   
     bDeviceSubClass         0 [unknown]   
     bDeviceProtocol         0   
     bMaxPacketSize0        16   
     idVendor           0x03c3 ZWO   
     idProduct          0x1f01 ZWO EFW   
     bcdDevice            0.00   
     iManufacturer           1 ZW0   
     iProduct                2 ZWO EFW   
     iSerial                 0   
     bNumConfigurations      1   
     Configuration Descriptor:   
       bLength                 9   
       bDescriptorType         2   
       wTotalLength       0x0029   
       bNumInterfaces          1   
       bConfigurationValue     1   
       iConfiguration          0   
       bmAttributes         0x80   
         (Bus Powered)   
       MaxPower               64mA   
       Interface Descriptor:   
         bLength                 9   
         bDescriptorType         4   
         bInterfaceNumber        0   
         bAlternateSetting       0   
         bNumEndpoints           2   
         bInterfaceClass         3 Human Interface Device   
         bInterfaceSubClass      0 [unknown]   
         bInterfaceProtocol      0   
         iInterface              0   
         Warning: Descriptor too short   
           HID Device Descriptor:   
             bLength                 9   
             bDescriptorType        33   
             bcdHID               1.01   
             bCountryCode            0 Not supported   
             bNumDescriptors         2   
             bDescriptorType        34 (null)   
             wDescriptorLength      68   
             bDescriptorType         0 (null)   
             wDescriptorLength       0   
             Report Descriptor: (length is 68)   
               Item(Global): Usage Page, data= [ 0x00 0xff ] 65280   
                               (null)   
               Item(Local ): (null), data= [ 0x01 ] 1   
                               (null)   
               Item(Main  ): (null), data= [ 0x01 ] 1   
                               Application   
               Item(Global): (null), data= [ 0x01 ] 1   
               Item(Global): (null), data= [ 0x0f ] 15   
               Item(Global): (null), data= [ 0x08 ] 8   
               Item(Global): (null), data= [ 0xff 0x00 ] 255   
               Item(Global): (null), data= [ 0x00 ] 0   
               Item(Local ): (null), data= [ 0x01 ] 1   
                               (null)   
               Item(Main  ): (null), data= [ 0x02 ] 2   
                               Data Variable Absolute No_Wrap Linear   
                               Preferred_State No_Null_Position Non_Volatile   
   Bitfield   
               Item(Global): (null), data= [ 0x02 ] 2   
               Item(Global): (null), data= [ 0x0f ] 15   
               Item(Global): (null), data= [ 0x08 ] 8   
               Item(Global): (null), data= [ 0xff 0x00 ] 255   
               Item(Global): (null), data= [ 0x00 ] 0   
               Item(Local ): (null), data= [ 0x01 ] 1   
                               (null)   
               Item(Main  ): (null), data= [ 0x02 ] 2   
                               Data Variable Absolute No_Wrap Linear   
                               Preferred_State No_Null_Position Non_Volatile   
   Bitfield   
               Item(Global): (null), data= [ 0x03 ] 3   
               Item(Global): (null), data= [ 0x0f ] 15   
               Item(Global): (null), data= [ 0x08 ] 8   
               Item(Global): (null), data= [ 0xff 0x00 ] 255   
               Item(Global): (null), data= [ 0x00 ] 0   
               Item(Local ): (null), data= [ 0x01 ] 1   
                               (null)   
               Item(Main  ): (null), data= [ 0x02 ] 2   
                               Data Variable Absolute No_Wrap Linear   
      
   [continued in next message]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)