If your card is supported by Natit/clones, it should be possible to build a working gfx-string with TV-Out support. I think this guide is also useful for people with other cards.
Always remember: that gfx-strings can't offer better support that Natit.
1. Install Natit (
http://forum.insanelymac.com/index.php?showforum=129)
2. Reboot
3. Console:$ioreg -l -w0 -p IODeviceTree|grep ATY|grep name
the output will be something like
| | | "name" = <"ATY,PrionaceParent">
| | | "name" = <"ATY,PrionaceB">
| | "name" = <"ATY,PrionaceB">
4. Open template.plist with your favour texteditor:
Replace everything which is marked (may devpath (too little time)) with the output above
If not sure look at the x1950pro.plist.
5. execute gfxutil (
http://forum.netkas.org/index.php/topic,64.0.html)
Terminal:$./gfxutil -v -i xml -o hex template.plist mystring.hex
6. install string:
http://forum.netkas.org/index.php/topic,66.0.html (use mystring.hex)
7. Remove Natit:
mv /System/Library/Extensions/Natit.kext /System/Library/Extensions/Natit.kext.bak
8. Reboot
TODO:
NVIDIA support (no nvidia card available, my guide should work with nvidia but you also have to change compatible)
HOWTO find devpath (to little time

)
Write a script which does everything
Make article nicer
PS: any critics are welcome (sry for bad English)
special thanks to:
Minority, tom3q, netkas and mcmatrix
pls test
bb (bierbo24@insanlymac)