Read the manual page about "vga_drawpixel" function. I'm not sure you can use this if you run under X. Here is a useful link: http://linux.die.net/man/3/vga_dr

Read the manual page about "vga_drawpixel" function. I'm not sure you can use this if you run under X. Here is a useful link: http://linux.die.net/man/3/vga_drawpixel http://linux.die.net/man/3/vga_drawpixel You should probably use a more advanced graphics library like the one provided by Gnome, but if you want to learn how to do it from scratch I suppose you need to start from a text mode Linux installation.