Question: I have correctly configured a dual monitor setup on Ubuntu Linux, Karmic 9.10. I use the Fn+CRT/LCD key to switch between modes, but I have to cycle through 5 modes before I get to the one that I use.

The modes that it cycles through (one for each Fn+CRT/LCD keypress) are:

1. LCD only
2. CRT only
3. Both, with CRT below LCD
4. Both, with CRT to the right of LCD
5. Both, mirrored

Is there any way I can disable some of these modes so that I don't have to cycle through so many to switch between the two I actually use?

I am on a Dell XPS M1330.

Answer: 
In the mean time, to work around this problem, I ended up building custom xrandr commands that switch between the modes that I use, and created launchers for these xrandr commands on my doc/menu.

* Dual-Monitor: `xrandr --output LVDS1 --mode 1280x800 --output VGA1 --below LVDS1 --mode 1280x1024`
* Mirror Screens: `xrandr --output LVDS1 --mode 1024x768 --output VGA1 --same-as LVDS1 --mode 1024x768`
* Laptop Screen Only: `xrandr --output LVDS1 --mode 1280x800 --output VGA1 --off`

If constructing your own scripts, you can find your monitor output names (LVDS1 and VGA1 for me) by running `xrandr` without any arguments. `man xrandr` is helpful for figuring out the options you can use to get the layout like you want it.

This workaround works great for me, eliminating the need to solve the initial problem.
[The Ubuntu wiki has a page which should be a good starting point.](https://wiki.ubuntu.com/Hotkeys/Troubleshooting)