CRT or TV
If playing DVDs on the TV is your goal, perhaps you might want to try the setup I use. I can switch between using my CRT at 1280x1024, or use my TV at 1024x768 without restarting X windows. Here how to do it:
change the line in the screen section:
Option "MetaModes" "1280x1024, 800x600"
Option "MetaModes" "1280x1024, NULL; NULL, 800x600"
Place a # in front of the TwinViewOrientation option line
After this starting X will cause you to use the CRT at 1280x1024 with the TV output disabled. To switch to TV at 800x600 with CRT disabled, press 'Ctrl','Alt', and '+'(number pad) keys together. To switch back press it again.
Hope thats what your looking for,