Hi, The Elecom DEFT is a trackball mouse, a picture can be found here [1]. As you can see, there're three Fn keys at the top of the mouse. These keys doesn't work on current Linux kernel. Complains from several users can be found on the internet [1][2]. The problem is in the HID report sent by the device, only 5 standard buttons are reported. There's an additional 3*1 bit item without any usage page in the report, which corresponds to the Fn buttons. This patch remove that item, and change the number of standard buttons to 8. [1]: http://xahlee.info/kbd/elecom_trackball.html [2]: https://www.reddit.com/r/Trackballs/comments/4pu3cv/elecom_mdt2_fn_buttons_on_linux/ Regards, Yuxuan Shui -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
