AMD's GCN architecture is about 7 years old and fully supported. Open source support for the previous TeraScale architecture is reportedly fairly good too, though no Vulkan.
I thought amdgpu only officially supported GCN 1.2 and later, which is more like 4.5 years old?
Pity that to use those I would need to replace my laptop, meanwhile the DirectX 11 driver still works.