salmanoff/docs/api-drm-server-linux.md

DeviceSpec: API drm() from server linux():

The API is Linux DRM/KMS. The server is Linux itself. This server provides direct capture of frames at the kernel so it works for both Linux and Wayland. There's a program known as GPU Screen Recorder that is able to use this to capture specific windows on X11, but the window-specific capture doesn't work with Wayland. Irrespective, whole-screen capture works on both GFX servers.

Notes:

• modetest utility in ubuntu package libdrm-tests is relevant.
• kmscube is apparently relevant.
• drm_info from ubuntu pkg drm-infois relevant.