I SOLVED as follows:

In /etc/default/grub set this line:

GRUB_CMDLINE_LINUX="nomodeset"

And in /etc/modprobe.d/radeon-kms.conf set this line:

options radeon modeset=0

If the radeon-kms.conf file does not exist, create it.

Rebooting

After login connect svideo and run this:

xrandr -s 800x600
xrandr --addmode S-video 800x600
xrandr --output S-video --mode 800x600

now svideo is enable!!!!

Sorry for my bed English and Good luck everyone!

-- 
ati radeon xpress 200M no s-video output, no tv screen detected
https://bugs.launchpad.net/bugs/573550
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