$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install AMD Open Source Drivers on Mint Gnu/Linux Distro

GNU/Linux Mint Installing AMD Open Source Drivers Guide

How to Install AMD Open Source Graphics Drivers in Mint GNU/Linux desktops – Step by step Tutorials.

And Open Source Radeon Graphics Drivers for Mint 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.

How to Install Radeon Open Source Drivers on Mint GNU/Linux Distro

GNU/Linux Mint AMD Open Source Driver Installation Guide