Bug#443584: xrandr does not recognise conncted s-video

["Nadav Kavalerchik" <nadavkav@gmail.com>]

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

works great :-)

and stays this way too. no after effects when i use the mouse or the keyboard.

although i watch the output display on the S-Video (tv) i get disconnected message from xrandr.
laptop:~# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2304 x 1024
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0*    60.0
   800x600        60.3
   640x480        59.9
S-video disconnected (normal left inverted right x axis y axis)
   800x600        60.3


i tried adding other modes: 1024x768 and 640x480 with no success, way ?
laptop:~# xrandr --addmode S-video 1024x768
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  155 (RANDR)
  Minor opcode of failed request:  18 ()
  Serial number of failed request:  16
  Current serial number in output stream:  17

also, when playing video with vlc/xine/mplayer i have to change output driver to X11 
otherwise no output on the S-Video (tv) only on the LVDS