I have CentOS installed on my laptop. I hooked up my TV via VGA and it works, just not as I'd like it to. The left side (on the TV) is cut off, like the image is justified too far left. I want it to be centered, but I also want to use a different resolution. I use a netbook, and thus my laptop screen is tiny, meaning some things can't fit in the same window without scrolling. I want my TV to fix that for me.
Would the following link be what you are looking for? CentOS Dual-screen doesn't work If you need anymore help, comment.
-Hope this helps