Bridges raw hardware node file descriptors into high-performance execution rendering states.
The modetest utility, provided by libdrm , is the simplest way to interact with the DRM/KMS subsystem. It's a diagnostic tool that enumerates all DRM objects—connectors, encoders, CRTCs (display controllers), planes, and framebuffers—and can even set display modes and test pattern generation. Hands On Projects For The Linux Graphics Subsystem
gcc drm_bare_metal.c -o drm_bare_metal $(pkg-config --cflags --libs libdrm) sudo ./drm_bare_metal Use code with caution. Project 2: Writing a Minimal Wayland Compositor provided by libdrm