Purpose

KMS (Kernel Mode Setting) mode is a feature where RetroArch can use the OpenGL driver outside Xorg, running straight in the virtual terminal. It is a fairly obscure feature, but very powerful in a console scenario.

Requirements

To use KMS mode you need:

These require a fairly up-to-date distro.

After compiling RetroArch, you should see this when running retroarch --features:

1
2
KMS:
    KMS/EGL context support: yes

If KMS mode is working correctly, RetroArch should start up outside Xorg as well.