For 3D playback:
Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "screen" 0 0
EndSection
Section "Screen"
Identifier "screen"
Monitor "DFP1"
Device "fglrx"
DefaultDepth 24
SubSection "Display"
Modes "1080i"
Depth 24
EndSubSection
EndSection
Section "Monitor"
Identifier "DFP1"
Modeline "1080i" 74.25 1920 2008 2052 2200 1080 1085 1095 1125 interlace +hsync +vsync
Option "PreferredMode" "1080i"
EndSection