bluetooth afaik doesnt work at the moment in recent kernels.
(Brocken since 4.13? but it never worked for me on 4.x, I tried a few of the reichel 4.12 kernels. (similiar https://www.spinics.net/lists/linux-.../msg71173.html and https://lkml.org/lkml/2017/10/6/54)

4.16.3 can pair but nothing more.

serdev, device tree and powermanagment still needs work.

(edit added first url and finally second url)