This is the xorg.conf file for my RadeonHD setupt
Section "ServerLayout"
Option "AllowEmptyInput" "off"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
ModulePath "/usr/local/lib/xorg/modules"
FontPath "/usr/local/lib/X11/fonts/misc/"
FontPath "/usr/local/lib/X11/fonts/TTF/"
FontPath "/usr/local/lib/X11/fonts/OTF"
FontPath "/usr/local/lib/X11/fonts/Type1/"
FontPath "/usr/local/lib/X11/fonts/100dpi/"
FontPath "/usr/local/lib/X11/fonts/75dpi/"
EndSection
Section "Module"
Load "extmod"
Load "record"
Load "dbe"
Load "glx"
Load "dri"
Load "dri2"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/sysmouse"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
#DisplaySize 470 300 # mm
Identifier "Monitor0"
VendorName "DEL"
ModelName "DELL 2209WA"
HorizSync 30.0 - 83.0
VertRefresh 56.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
### [arg]: arg optional
#Option "NoAccel" # [<bool>]
#Option "SWcursor" # [</bool><bool>]
#Option "Dac6Bit" # [</bool><bool>]
#Option "Dac8Bit" # [</bool><bool>]
#Option "BusType" # [<str>]
#Option "CPPIOMode" # [<bool>]
#Option "CPusecTimeout" # <i>
#Option "AGPMode" # </i><i>
#Option "AGPFastWrite" # [<bool>]
#Option "AGPSize" # <i>
#Option "GARTSize" # </i><i>
#Option "RingSize" # </i><i>
#Option "BufferSize" # </i><i>
#Option "EnableDepthMoves" # [<bool>]
#Option "EnablePageFlip" # [</bool><bool>]
#Option "NoBackBuffer" # [</bool><bool>]
#Option "DMAForXv" # [</bool><bool>]
#Option "FBTexPercent" # <i>
#Option "DepthBits" # </i><i>
#Option "PCIAPERSize" # </i><i>
#Option "AccelDFS" # [<bool>]
#Option "IgnoreEDID" # [</bool><bool>]
#Option "DisplayPriority" # [<str>]
#Option "PanelSize" # [</str><str>]
#Option "ForceMinDotClock" # <freq>
#Option "ColorTiling" # [<bool>]
#Option "VideoKey" # <i>
#Option "RageTheatreCrystal" # </i><i>
#Option "RageTheatreTunerPort" # </i><i>
#Option "RageTheatreCompositePort" # </i><i>
#Option "RageTheatreSVideoPort" # </i><i>
#Option "TunerType" # </i><i>
#Option "RageTheatreMicrocPath" # <str>
#Option "RageTheatreMicrocType" # </str><str>
#Option "ScalerWidth" # <i>
#Option "RenderAccel" # [<bool>]
#Option "SubPixelOrder" # [<str>]
#Option "ShowCache" # [<bool>]
#Option "DynamicClocks" # [</bool><bool>]
#Option "VGAAccess" # [</bool><bool>]
#Option "ReverseDDC" # [</bool><bool>]
#Option "LVDSProbePLL" # [</bool><bool>]
#Option "AccelMethod" # <str>
#Option "DRI" # [<bool>]
#Option "ConnectorTable" # <str>
#Option "DefaultConnectorTable" # [<bool>]
#Option "DefaultTMDSPLL" # [</bool><bool>]
#Option "TVDACLoadDetect" # [</bool><bool>]
#Option "ForceTVOut" # [</bool><bool>]
#Option "TVStandard" # <str>
#Option "IgnoreLidStatus" # [<bool>]
#Option "DefaultTVDACAdj" # [</bool><bool>]
#Option "Int10" # [</bool><bool>]
#Option "EXAVSync" # [</bool><bool>]
#Option "ATOMTVOut" # [</bool><bool>]
#Option "R4xxATOM" # [</bool><bool>]
# Option "ShadowFB" true
# Option "NoAccel" "True"
# Option "RandRRotation" "True"
Identifier "Card0"
# Driver "radeon"
# Driver "xf86-video-radeonhd"
Driver "radeonhd"
VendorName "ATI Technologies Inc"
BoardName "RV610 [Radeon HD 2400 XT]"
BusID "PCI:1:0:0"
Option "NoAccel" "True"
# Option "RenderAccel" "True"
# Option "AccelDFS" "True"
# Option "AccelMethod" # <str>
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 16
Subsection "Display"
Depth 8
Modes "1680x1050"
# Virtual 2730 1680
Virtual 3360 1050
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 16
Modes "1680x1050"
# Virtual 2730 1680
Virtual 3360 1050
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 24
Modes "1680x1050"
# Virtual 2730 1680
Virtual 3360 1050
ViewPort 0 0
EndSubsection
EndSection
