How to get greater resolution

[reader at newsguy.com]

Running Gentoo linux
Kde-3.4.1

How can I get a greater resolution in my kde sessions?

It seems 1152x1024 is the highest I can get.  But with the monitor
mentioned in xorg.conf I should be able to get 1280x1024 or even
greater.

monitor is:
	ModelName    "hp mx703"
	HorizSync    30.0 - 70.0
	VertRefresh  50.0 - 140.0

========

cat /etc/X11/xorg.conf:

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	RgbPath      "/usr/lib/X11/rgb"
	ModulePath   "/usr/lib/modules"
	FontPath     "/usr/share/fonts/misc/"
	FontPath     "/usr/share/fonts/TTF/"
	FontPath     "/usr/share/fonts/Type1/"
	FontPath     "/usr/share/fonts/CID/"
	FontPath     "/usr/share/fonts/75dpi/"
	FontPath     "/usr/share/fonts/100dpi/"
EndSection

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

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
EndSection

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

Section "Monitor"
	#DisplaySize	  320   240	# mm
	Identifier   "Monitor0"
	VendorName   "HWP"
	ModelName    "hp mx703"
	HorizSync    30.0 - 70.0
	VertRefresh  50.0 - 140.0
	Option	    "DPMS"
EndSection

Section "Device"
	Identifier  "Card0"
	Driver      "ati"
	VendorName  "ATI Technologies Inc"
	BoardName   "Radeon RV100 QY [Radeon 7000/VE]"
	BusID       "PCI:1:0:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	DefaultDepth      24
 	SubSection "Display"
		Viewport   0 0
		Virtual   1600 1280
		Depth     24
      Modes     "1152x1024" "1280x1024"
# Modes     "1152x1024" "1280x1024" "1600x1280"
	EndSubSection
EndSection

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