分辨率about REDHAT WS 4.0

blueskins

here is the content of /etc/X11/xorg.conf
  
# Xorg configuration created by system-config-display

Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
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  "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            "rotocol" "IMPS/2"
        Option            "Device" "/dev/input/mice"
        Option            "ZAxisMapping" "4 5"
        Option            "Emulate3Buttons" "yes"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "LCD Panel 1280x800"
        HorizSync    31.5 - 90.0
        VertRefresh  60.0 - 60.0
        Option            "dpms"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "i810"
        VendorName  "Videocard vendor"
        BoardName   "Intel 915"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     16
                Modes    "1280x960" "1024x768" "800x600" "640x480" "1280x768"

        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes    "1280x960" "1024x768" "800x600" "640x480" "1280x768"
        EndSubSection
EndSection

Section "DRI"
        Group        0
        Mode         0666
EndSection


I want to use 1280X768,but failed.
thank for your help
My computer is ASUS W3A 1.73G 60G 512 ddr2 ,GMA900