Hands-On Projects for the Linux Graphics Subsystem by Web Webster provides a structured approach for students and enthusiasts to explore the inner workings of Linux graphics through practical software projects. It focuses on the Ubuntu Linux
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
Call drmModeGetResources to iterate through the available connectors (HDMI, eDP), encoders, and CRTCs (Cathode Ray Tube Controllers) linked to the hardware. Hands On Projects For The Linux Graphics Subsystem
Beyond specific coding tasks, the projects emphasize understanding the Direct Rendering Manager (DRM) Kernel Mode Setting (KMS) APIs, which are the modern standard for Linux graphics. DRM/KMS Transitions
Use ioctl system calls with FBIOGET_VSCREENINFO and FBIOGET_FSCREENINFO to retrieve screen resolution, bit depth (bpp), and line length. Hands-On Projects for the Linux Graphics Subsystem by
(on a system with two GPUs or an iGPU plus discrete GPU):
: The headless render node used purely for hardware-accelerated GPU compute and rendering (does not control display outputs). Project 1: Bare-Metal DRM/KMS Framebuffer Rendering part of libdrm
The final program can be extended to handle page flips, multiple planes, or even simple sprite animations. The modetest utility, part of libdrm , is an excellent companion tool for debugging your code. This project directly shows how KMS powers modern Wayland compositors and display servers.