В библиотеке написано, что используют упрощенный HID дескриптор. Если поставить полный заработает, есть ли у кого-нибудь опыт?
/* We use a simplifed keyboard report descriptor which does not support the
* boot protocol. We don't allow setting status LEDs and but we do allow
* simultaneous key presses.
* The report descriptor has been created with usb.org's "HID Descriptor Tool"
* which can be downloaded from
http://www.usb.org/developers/hidpage/.
* Redundant entries (such as LOGICAL_MINIMUM and USAGE_PAGE) have been omitted
* for the second INPUT item.
*/