Ubuntu 16.04 - fglrx is deprecated - is "radeon" driver OK these days?

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But no one yet seems to have found out how to do it, even there's alot of discussion going on about this topic. It's like some hidden mysterium. A pretty demoralizing argument is this:

mnagy@radeon:~$ apt-file search /etc/OpenCL/vendors
beignet-opencl-icd: /etc/OpenCL/vendors/intel-beignet-x86_64-linux-gnu.icd
mesa-opencl-icd: /etc/OpenCL/vendors/mesa.icd
nvidia-opencl-icd-304: /etc/OpenCL/vendors/nvidia.icd
nvidia-opencl-icd-304-updates: /etc/OpenCL/vendors/nvidia.icd
nvidia-opencl-icd-340: /etc/OpenCL/vendors/nvidia.icd
nvidia-opencl-icd-361: /etc/OpenCL/vendors/nvidia.icd

Above one is pretty clear. Without an ICD, there's no OpenCL.

And when it comes to what people call "amdgpu", this is all:

mnagy@radeon:~$ apt-cache search amdgpu
xserver-xorg-video-amdgpu - X.Org X server -- AMDGPU display driver
libdrm-amdgpu1 - Userspace interface to amdgpu-specific kernel DRM services -- runtime
libdrm-amdgpu1-dbg - Userspace interface to amdgpu-specific kernel DRM services -- debugging symbols
xserver-xorg-video-amdgpu-dbg - X.Org X server -- AMDGPU display driver (debugging symbols)

I've installed them all. Nothing.