Since I couldn't find a solution in older posts, I suppose I've to add the following device to the incompatible hardware thread?

It's a no name IR wireless keyboard with integrated trackball and several years old already. Works under Windows, but under Ubuntu the mouse functions (trackball, butons) are not supported, it's just workig as a plain keyboard. USB legacy support is enabled in BIOS, but doesn't cause a change.

Lsusb output: Bus 003 Device 002: ID 05af:8005 Jing-Mold Enterprise Co., Ltd

Any suggestions to possibly make it work would be vey much apreciated.