XConfig - how to get rid of dithering

[Lorin Lund]

I am running on an old Toshiba Portege with this video
chipset:
NM2200 [MagicGraph 256AV]
Everything is showing dithered under X but when I boot
to Windows I get great color.  I suspect that this is
merely a configuration problem but I don't 
know what is wrong with my config file.  (see attached)

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Section "ServerLayout"
	Identifier     "XFree86 Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	RgbPath      "/usr/X11R6/lib/X11/rgb"
	ModulePath   "/usr/X11R6/lib/modules"
	FontPath     "/usr/X11R6/lib/X11/fonts/misc/"
	FontPath     "/usr/X11R6/lib/X11/fonts/Speedo/"
	FontPath     "/usr/X11R6/lib/X11/fonts/Type1/"
	FontPath     "/usr/X11R6/lib/X11/fonts/75dpi/"
	FontPath     "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection

Section "Module"
	Load  "dbe"
	Load  "dri"
	Load  "extmod"
	Load  "glx"
	Load  "record"
	Load  "xtrap"
	Load  "speedo"
	Load  "type1"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "keyboard"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/sysmouse"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor Model"
	HorizSync    31.5 - 57.0
	VertRefresh  50.0 - 100.0
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     "NoLinear"           	# [<bool>]
        #Option     "NoAccel"            	# [<bool>]
        #Option     "SWcursor"           	# [<bool>]
        #Option     "noMMIO"             	# [<bool>]
        #Option     "internDisp"         	# [<bool>]
        #Option     "externDisp"         	# [<bool>]
        #Option     "LcdCenter"          	# [<bool>]
        #Option     "ShadowFB"           	# [<bool>]
        #Option     "NoStretch"          	# [<bool>]
        #Option     "pciBurst"           	# [<bool>]
        #Option     "ShowCache"          	# [<bool>]
        #Option     "Rotate"             	# [<str>]
        #Option     "StrangeLockups"     	# [<bool>]
        #Option     "DisplayHeight480"   	# [<bool>]
        #Option     "progLcdModeRegs"    	# [<bool>]
        #Option     "progLcdModeStretch" 	# [<bool>]
        #Option     "overrideValidateMode" 	# [<bool>]
        #Option     "VideoKey"           	# <i>
        #Option     "OverlayMem"         	# <i>
        #Option     "Interlace"          	# <i>
	Identifier  "Card0"
	Driver      "neomagic"
	VendorName  "Neomagic Corporation"
	BoardName   "NM2200 [MagicGraph 256AV]"
	BusID       "PCI:0:4:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Depth     1
	EndSubSection
	SubSection "Display"
		Depth     4
	EndSubSection
	SubSection "Display"
		Depth     8
	EndSubSection
	SubSection "Display"
		Depth     15
	EndSubSection
	SubSection "Display"
		Depth     16
	EndSubSection
	SubSection "Display"
		Depth     24
	EndSubSection
EndSection