Comment 1 for bug 587523

Just look at the lsusb -vvv output for the HID device in the following pages and you will find quite similar "lsusb -vvv" output which contains "** UNRECOGNIZED: 09 21 xx xx xx xx xx xx xx xx". 09 21 is for HID Class Descriptor.

Ubuntu (9.10)
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/368268
      bInterfaceClass 3 Human Interface Device
      bInterfaceSubClass 1 Boot Interface Subclass
      bInterfaceProtocol 2 Mouse
      iInterface 0
      ** UNRECOGNIZED: 09 21 10 01 00 01 22 52 00

http://forum.eeeuser.com/viewtopic.php?id=79783
      bInterfaceClass 3 Human Interface Device
      bInterfaceSubClass 0 No Subclass
      bInterfaceProtocol 0 None
      iInterface 0
      ** UNRECOGNIZED: 09 21 00 01 00 01 22 2f 01

https://bugs.launchpad.net/ubuntu/+source/bluez/+bug/476510
      bInterfaceClass 3 Human Interface Device
      bInterfaceSubClass 1 Boot Interface Subclass
      bInterfaceProtocol 2 Mouse
      iInterface 0
      ** UNRECOGNIZED: 09 21 11 01 00 01 22 71 00