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 all the current existing pair modes the driver can use.
      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 one pair mode from the list. User can get index by 
    • 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: