Reading framebuffer at lowest level possible under X

Hello everybody, I hope this is the right place for this kind of questions. Otherwise I apologize for bothering! I've been searching a lot but I couldn't figure this out completely, as I wasn't able to find any documentation. So this is my problem: I want to read the framebuffer of the videocard

Reading framebuffer at lowest level possible under X

Hello everybody, I hope this is the right place for this kind of questions. Otherwise I apologize for bothering! I've been searching a lot but I couldn't figure this out completely, as I wasn't able to find any documentation. So this is my problem: I want to read the framebuffer of the videocard