How to Install Radeon Open Source Drivers on Gnu/Linux Distros
GNU/Linux Installing AMD Open Source Drivers Guide
How to Install AMD Open Source Graphics Drivers in GNU/Linux desktops – Step by step Tutorials.
And Open Source Radeon Graphics Drivers for Linux includes Updated Free Graphics Drivers for AMD/ATI Graphics Cards.
These drivers are based on the Mesa 3D stack and support modern AMD GPUs using the AMDGPU kernel module.
Especially relevant: as a complement you may be intesested also to the MESA Graphics Drivers Suite Setup.
