Hi.
To start with i a newbie to, so dont expect anything advanced from me
I use Xandros with a Geforce TI4600 and had the same problem. Then i found YanC42 @
http://yanc.sourceforge.net/ and it solved my problem
If you try yanc you recognice the things i`ll explain below. I left all options at default values besides the ones below. Remember to run yanc as root, and if you get some lang error just download the separate Yanc.jar file and replace the old one.
Under "Screen" tab:
"Screen mode" to twinview
"2nd screen orientation" to clone
flipped "screen types, 2nd screen" to tv and then back to automatic (dont know if it makes any difference but a friend of mine changed it to tv and he got problems)
Under "Resolution" tab:
Marked "Available resolutions" to the desktop resolution i was running (marked only one alternative)
Changed "2nd screen - Maximum resolution" to 800x600 (I`ve read somewhere thats the limit for tv-out, some cards can manage 1024x768 but not mine)
Then i saved the settings and restarted X.
And voila.... Tv-Out!!
I Hope this will help you
Regards Gunde
*edit* When i tried 1024x768 resolution i got a blue grayish tv screen to