Dual Monitor Resolution Issue

[Analog Kid]

Hi,

   I have configured the xorg.conf (i.e. /etc/X11/xorg.conf) to allow
a dual monitor display (i.e. my Laptop Screen and an extrenal Monitor
through the VGA port at the back of my laptop). However, eventhough my
external monitor is capable of resolutions > 800x600 (with WindowsXP I
get my external monitor to resolutions as high as 1600x1200), it looks
like my external monitor resolution does NOT improve (beyond what I
think looks like 800x600) even with proper changes/edits to the
xorg.conf file. I have currently set both my laptop screen and my
external monitor to "1024x768", but my external monitor resolution
looks really low (more like 800x600) compared to my laptop screen
resolution.

   I have pasted my xorg.conf file below (and attached it). Please
take a look at it and see if I am doing something wrong there.

Laptop Screen : "screen0", "monitor0"
Extrenal Monitor: "screen1", "monitor1"

I am using the Radeon ATI Radeon Mobility 7500 videocard.

Thanks,
Sid
-- 
Siddharth Devarajan
Graduate Student
ECSE Department,
Rensselaer Polytechnic Institute, NY.
Ph: 518-248-7619.

# Xorg configuration created by system-config-display

Section "ServerLayout"
	Identifier     "Multihead layout"
	Screen      0  "Screen0" LeftOf "Screen1"
	Screen      1  "Screen1" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
	InputDevice    "Synaptics" "AlwaysCore"
	Option	    "Xinerama" "on"
	Option	    "Clone" "off"
EndSection

Section "Files"

# RgbPath is the location of the RGB database.  Note, this is the name of the 
# file minus the extension (like ".txt" or ".db").  There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
	RgbPath      "/usr/X11R6/lib/X11/rgb"
	FontPath     "unix/:7100"
EndSection

Section "Module"
	Load  "dbe"
	Load  "extmod"
	Load  "fbdevhw"
	Load  "glx"
	Load  "record"
	Load  "freetype"
	Load  "type1"
	Load  "synaptics"
	Load  "dri"
EndSection

Section "InputDevice"

# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
#	Option	"Xleds"		"1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
#	Option	"XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults).  For example, for a non-U.S.
# keyboard, you will probably want to use:
#	Option	"XkbModel"	"pc102"
# If you have a US Microsoft Natural keyboard, you can use:
#	Option	"XkbModel"	"microsoft"
#
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
#	Option	"XkbLayout"	"de"
# or:
#	Option	"XkbLayout"	"de"
#	Option	"XkbVariant"	"nodeadkeys"
#
# If you'd like to switch the positions of your capslock and
# control keys, use:
#	Option	"XkbOptions"	"ctrl:swapcaps"
# Or if you just want both to be control, use:
#	Option	"XkbOptions"	"ctrl:nocaps"
#
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	    "XkbModel" "pc105"
	Option	    "XkbLayout" "us"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "IMPS/2"
	Option	    "Device" "/dev/input/mice"
	Option	    "ZAxisMapping" "4 5"
	Option	    "Emulate3Buttons" "yes"
EndSection

Section "InputDevice"
	Identifier  "Synaptics"
	Driver      "synaptics"
	Option	    "Device" "/dev/input/mice"
	Option	    "Protocol" "auto-dev"
	Option	    "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Unknown monitor"
	HorizSync    31.5 - 37.9
	VertRefresh  50.0 - 70.0
	Option	    "dpms"
EndSection

Section "Monitor"
	Identifier   "Monitor1"
	VendorName   "Monitor Vendor"
	ModelName    "Unknown monitor"
	HorizSync    31.5 - 37.9
	VertRefresh  50.0 - 70.0
	Option	    "dpms"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "radeon"
	VendorName  "Videocard vendor"
	BoardName   "ATI Radeon Mobility 7500"
EndSection

Section "Device"
	Identifier  "Videocard1"
	Driver      "radeon"
	VendorName  "Videocard Vendor"
	BoardName   "ATI Radeon Mobility 7500"
	BusID       "PCI:1:0:0"
	Screen      1
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768"
	EndSubSection
EndSection

Section "Screen"
	Identifier "Screen1"
	Device     "Videocard1"
	Monitor    "Monitor1"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768"
	EndSubSection
EndSection

Section "DRI"
	Group        0
	Mode         0666
EndSection
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