ATI Setup in Linux

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sudo aticonfig --dtop=horizontal,reverse --overlay-on=0
      • Pair mode options: Following options are used for query add and remove pair modes. These options will be effective immediately. Other options on the same command line will be ignored.
--list-pairmode 
      list all the current existing pair modes the driver can use.
--add-pairmode=width0xheight0+width1xheight1
      Add one pair mode to the list. width0 and height0 are the 
      size of primary display and width1 and height1 for the 
      secondary  display.
--remove-pairmode=index 
      Remove one pair mode from the list. User can get index by 
      list-pairmode.
    • Using the Open source "Radeon" driver
      • ATI Video out
        • Using Xrandr
          • To use the TVout on Radeon 7500 or 9200 mobility, type following:
xrandr --output S-video --set load_detection 1 
xrandr --addmode S-video 800x600 
xrandr --output S-video --mode 800x600 

And set mode PAL or NTSC with:

xrandr --output S-video --set tv_standard ntsc 

If you want to use XVideo overlay on TV, try following command:

xvattr -a XV_CRTC -v 1 

Reference material: