AMD is in the process of developing and getting its new kernel driver (amdgpu) into mainline.
In the Linux subsection I provided steps on how to build your own kernel - this should get you going in the meantime.
Did you mean this post: Re: Fury x linux support ?
If yes and from what I have gotten rights and lefts, I need a kernel above 4.2 (which has been release as .deb which makes easier its installation): ref. How to Install / Upgrade to Linux Kernel 4.2 in Ubuntu | UbuntuHandbook
Well, I don't have the notebook at the time (a windows -10- is running on it, with some problems also...) but hope it will work. (I might have convinced my friend to give linux a try )
4.2 kernels prebuilt by Ubuntu still do not include it, which is why you have to build it on your own.
If you're not sure how to do this, let me know. I guess I could try to rebuild and post the images somewhere.