John's xorg.conf

Section "ServerLayout"
	Identifier     "Simple Layout"
	Screen         "Screen 1" 0 0
	InputDevice    "Mouse1" "CorePointer"
	InputDevice    "Keyboard1" "CoreKeyboard"
EndSection

Section "ServerFlags"
    Option    "AllowMouseOpenFail" "true"
    Option     "AIGLX" "true"
EndSection

Section "Files"
	FontPath     "/usr/share/fonts/misc"
	FontPath     "/usr/share/fonts/75dpi"
	FontPath     "/usr/share/fonts/100dpi"
	FontPath     "/usr/share/fonts/Type1"
EndSection

Section "Module"
	Load  "dbe"  	# Double buffer extension
	SubSection "extmod"
		Option	    "omit xfree86-dga"   # don't initialise the DGA extension
	EndSubSection
	Load  "freetype"
	Load  "glx"
	Load  "dri"
EndSection

Section "InputDevice"
	Identifier  "Keyboard1"
	Driver      "kbd"
	Option	    "AutoRepeat" "500 30"
	Option	    "XkbRules" "xorg"
	Option	    "XkbLayout" "fr"
	Option	    "XkbModel" "pc105"
EndSection

Section "InputDevice"
	Identifier  "Mouse1"
	Driver      "mouse"
	Option	    "Protocol" "Auto"	# Auto detect
	Option	    "Device" "/dev/input/mice"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
	Identifier   "DELL"
	HorizSync    31.5 - 64.3
	VertRefresh  50.0 - 70.0
EndSection

Section "Device"
	Identifier  "i915"
	Driver      "i810"
	Option     "DRI"  "true"  
EndSection

Section "Screen"
	Identifier "Screen 1"
	Device     "i915"
	Monitor    "DELL"
	Option "AddARGBGLXVisuals" "true"
#	   Option "DisableGLXRootClipping" "true"
   DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     8
		Modes    "1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1280x1024" "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "Extensions"
  Option "Composite" "Enable"
EndSection