This video output problem is apparently a known bug in xserver-xorg-
video-intel driver and/or in Xorg_RandR_1.2

See following URL:
http://www.thinkwiki.org/wiki/Xorg_RandR_1.2#Note_for_Ubuntu_Gutsy_users
"Known Limitations - Gray output with integrated TV-out and PAL TVs"


And according to http://ubuntuforums.org/archive/index.php/t-259816.html  , 
forum user "motin" says:
"The most probable reason it's black and white is that the 915GM (intel driver) 
outputs ntsc as default
  Even if you have switched it to pal in MSwindows it will still be ntsc in 
linux as its the hardware default.
 This will result in a bw picture on many eu (European) TV's 
 I have not been able to locate a utility to switch the tvout to PAL in linux"

-- 
Black and white S-video output only on PAL TVs with intel video driver
https://bugs.launchpad.net/bugs/109934
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