zitev wrote:

I attached the lsusb output!

Perfect, thanks.

Bus 001 Device 004: ID 1044:7a02 Chu Yuen Enterprise Co., Ltd 

[...]

    bNumInterfaces          3

[...]

    Interface Descriptor:
      bInterfaceClass         3 Human Interface Device
      iInterface              2 KB

[...]

    Interface Descriptor:
      bInterfaceClass         3 Human Interface Device
      iInterface              3 Mouse

[...]

    Interface Descriptor:
      bInterfaceClass         3 Human Interface Device
      iInterface              4 K8100 Interface

Can you set up usbmon and get a trace of e.g., pressing, holding,
then releasing the "a" key?  See Documentation/usb/usbmon.txt
in the Linux source or the doc directory of the linux-doc-3.2
package for details.

It works roughly like this:

1. Mount debugfs and load the usbmon module:

  mount -t debugfs debugfs /sys/kernel/debug
  modprobe usbmon

2. Start tracing:

  {
    sleep 1; # one second of quiet
    cat /sys/kernel/debug/usb/usbmon/1u >/tmp/mon.out &
    sleep 20; # twenty seconds or so to run the test
    kill $!; # and then stop collecting data
  }

3. Somehow summarize the output.  If it is fairly small, an
attachment is fine; otherwise, excerpts and maybe a link to a
copy that can be downloaded online might work.

Hope that helps,
Jonathan