Originally Posted by project722
Nothing seems to be working. I noticed your config shows "videocard0" and "videocard1". I only have the one video controller.
They should still pick up the same video card. One for each monitor. You need to get a good feel for the difference between a SCREEN and a MONITOR. A monitor is a physical thing, you have 2 of them. A screen is more abstract, you can have 1 or 2 of them.
Having seperate X screens does not mean that you have a clone. If you have seperate X screens, some of the practicle implications are: you can't drag windows from one screen to the other, the screen with the mouse on it is the one that is active, you will have different desktop background and panel settings for each screen.
If you have a continuous desktop across both monitors (using xinerama) it's only considered one screen: you can move windows between screens, you'll have one giant background, (I think that your panel will stretch accross both of them if they are horizontally oriented), and I think when you maximize a windows it will stretch over both of them. I'm not sure about some of these because I've never really used Xinerama, I have an nvidia card and it has its own built in feature for having one screen span multiple monitors.