ZorinOS is based on a stable LTS version of Ubuntu. It is not at the cutting edge of linux development and intentionally so. As AMD kit is supported by linux kernels (a good thing) as linux kernels progress newer AMD kit is supported. I am wondering if your machine is so new that it may need a newer kernel.
Maybe others here can chip in and help to decide if that is a worthy direction to follow in the case of your specific AMD spec.
The process of installing a later kernel has been covered on the forum many times. e.g. [HOW TO] Easily install a later Kernel (Needs Net Connection)