Comment 4 for bug 713556

Seems like it's not an udev or X problem - kernel thinks it found a joystick: it has an entry 'js0' in '/sys/class/input'. Moreover it reports two interface descriptors for the device (as seen in attached 'lsusb -v -d 09da:8090' output). One for mouse and another one for ... keyboard. When I tried to look at the events evtest was able to capture for the corresponding to the 'js0' '/dev/input/eventN' device node it showed a long list of key events with different codes (along with joystick events). I was once even able to receive some events by clicking on the mouse whell - and couldn't reproduce it later. So this is probably just another buggy A4Tech device (afaik there are already a couple of quirks in the kernel for their HID devices).

PS: I have an A4Tech X7 mouse but the symptoms are quite the same. It even has the same USB ids.