Bug#443585: switching to s-video sets LVDS and S-Video brightness to max and inverts colors

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

   xrandr --output LVDS --off --output S-video --auto

did not help until i rebooted and tried again.
if i plug the s-video during a session and not while it was booting 
xrandr is not able to use s-video.

what was even better is your other suggestion:
xrandr --addmode S-video 800x600 
xrandr --output S-video --mode 800x600
xrandr --output LVDS --off