Разрешение экрана.

Не получается поменять разрешение экрана на меньшее. Сейчас 1024х768, нужно и 800х600 и 640х480.


Думаю это потому-что в xorg.conf прописано только разрешение 1024х768
как дописать остальные? и как рассчитать моделайн? Система Debian Etch

Вот xorg.conf

Section "Files"
        FontPath        "/usr/share/fonts/X11/misc"
        FontPath        "/usr/X11R6/lib/X11/fonts/misc"
        FontPath        "/usr/share/fonts/X11/cyrillic"
        FontPath        "/usr/X11R6/lib/X11/fonts/cyrillic"
        FontPath        "/usr/share/fonts/X11/100dpi/:unscaled"
        FontPath        "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
        FontPath        "/usr/share/fonts/X11/75dpi/:unscaled"
        FontPath        "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
        FontPath        "/usr/share/fonts/X11/Type1"
        FontPath        "/usr/X11R6/lib/X11/fonts/Type1"
        FontPath        "/usr/share/fonts/X11/100dpi"
        FontPath        "/usr/X11R6/lib/X11/fonts/100dpi"
        FontPath        "/usr/share/fonts/X11/75dpi"
        FontPath        "/usr/X11R6/lib/X11/fonts/75dpi"
        # path to defoma fonts
        FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
        Load    "dbe"

        Load    "i2c"
        Load    "bitmap"
        Load    "ddc"
        Load    "dri"
        Load    "extmod"
        Load    "freetype"
        Load    "glx"
        Load    "int10"
        Load    "vbe"
EndSection

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "CoreKeyboard"
        Option "XkbRules" "xorg"
        Option "XkbModel" "pc105"
        Option "XkbLayout" "us,ru(winkeys)"
        Option "XkbOptions" "grp:ctrl_shift_toggle,grp_led:scroll,altwin:menu"
EndSection

Section "InputDevice"
        Identifier      "Configured Mouse"
        Driver          "mouse"
        Option          "CorePointer"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "ImPS/2"
        Option          "Emulate3Buttons"       "true"
    Option      "EmulateWheel"          "on"
    Option      "EmulateWheelButton"    "2"
EndSection

Section "InputDevice"
        Identifier      "Synaptics Touchpad"
        Driver          "synaptics"
        Option          "SendCoreEvents"        "true"
        Option          "Device"                "/dev/psaux"
        Option          "Protocol"              "auto-dev"
        Option          "HorizScrollDelta"      "0"
        Option          "TapButton2"            "3"
        Option          "SHMConfig"             "on"
EndSection

Section "Device"
        Identifier      "Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller"
        Driver          "i810"
        BusID           "PCI:0:2:0"
        Option          "DisplayInfo" "FALSE"
        Option          "VBERestore" "yes"
#       VideoRam        131072
        Option          "XAANoOffscreenPixmaps" "true"

        Option "AllowGLXWithComposite" "true"

        Option          "MTRR" "on"
        Option          "UseFBDev" "false"
        Option          "LinearAlloc" "32768"
        Option          "AccelMethod" "EXA"
#        Screen          0
#       Option          "MonitorLayout" "CRT,LFP"
        #Option          "DevicePresence" "true"
        #Option          "Clone"  "true"
EndSection


Section "Device"
        Identifier      "Intel External"
        Driver          "i810"
        BusID           "PCI:0:2:0"
        Option          "DisplayInfo" "FALSE"
        #Option          "VBERestore" "yes"
        Screen          1
        Option          "Rotate" "true"
EndSection


Section "Monitor"
        Identifier      "Универсальный монитор"
        Option          "DPMS"
EndSection

Section "Monitor"
        Identifier      "External monitor"
        Option          "DPMS"
EndSection

Section "Screen"
        Identifier      "External Screen"
        Device          "Intel External"
        Monitor         "External Monitor"
        DefaultDepth    24
        SubSection "Display"
                Modes           "1024x768" "1280x1024" "1600x1200" "640x480" "600x800"
                #Modes          "XGA 60"  "SXGA 60" "UXGA 60" "VGA 75" "SVGA 75"
                Virtual 2048 2048
        EndSubSection
EndSection



Section "Screen"
        Identifier      "Default Screen"
        Device          "Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller"
        Monitor         "Универсальный монитор"

        DefaultDepth    24
        SubSection "Display"
                Depth           1
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           4
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           8
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           15
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           16
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1024x768" "800x600" "640x480"
        EndSubSection
EndSection



Section "ServerLayout"
        Identifier      "Default Layout"
        Screen          0 "Default Screen"
#       Option          "Xinerama"  "true"
#       Screen          1 "External Screen" RightOf "Default Screen"
        InputDevice     "Generic Keyboard"
        InputDevice     "Configured Mouse"
        InputDevice     "Synaptics Touchpad"
        Option "AIGLX" "true"

EndSection

Section "DRI"
        Mode    0666
EndSection


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