A quick Google search found &quot;Direct Rendering Manager&quot;: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Direct_Rendering_Manager" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Direct_Rendering_Manager</a><p>Doesn&#x27;t look like something you&#x27;d necessarily need to know about unless you were developing for the GPU on Linux.