Hands On Projects For The Linux Graphics Subsystem Guide

Exploring the Linux graphics subsystem involves navigating a layered stack that bridges high-level user applications with low-level kernel drivers. Below are structured, hands-on projects designed to build your expertise from the kernel level up to userspace compositors. 1. Virtual Kernel Mode Setting (VKMS) Enhancement

module_init(simple_driver_init); module_exit(simple_driver_exit);

Enable DRM tracepoints (echo 1 > /sys/kernel/debug/tracing/events/drm/enable)
Run a graphics workload
Capture and analyze the trace

Implementation Steps

Set up GBM device from DRM fd.
Create an EGLDisplay from GBM.
Initialize EGL, choose config, create context.
Create GBM surface for scanout.
Render a triangle rotating using glDrawArrays each frame.
Use eglSwapBuffers with damage region.
Atomic commit the GBM bo to display.