Hands On Projects For The Linux Graphics Subsystem Jun 2026

Before diving into code, you must understand how applications talk to the graphics server.

glxinfo in the VM reports a real GPU renderer, and glmark2 runs at near-native speed. Hands On Projects For The Linux Graphics Subsystem

Read back the current framebuffer contents from the GPU using DRM. Before diving into code, you must understand how

int main() int fd = open("/dev/dri/card0", O_RDWR); drmModeRes *res = drmModeGetResources(fd); // Find first connected connector... drmModeConnector *conn = drmModeGetConnector(fd, res->connectors[0]); drmModeEncoder *enc = drmModeGetEncoder(fd, conn->encoders[0]); drmModeCrtc *crtc = drmModeGetCrtc(fd, enc->crtc_id); Before diving into code

: Create a standalone C application that displays a test pattern on the screen using Actionable Steps drmModeGetResources API to identify active connectors and CRTCs. Allocate a framebuffer (using