xorg.conf: "HorizSync" and "VertRefresh" not automatically entered upon installation

OS: Ubuntu 5.10 final release
Computer: Travelmate 233 XC laptop

Problem: Full installation on my laptop results in a screen with a large black
border around all 4 sides - the full screen is not used. This occured both times
I tried installing ubuntu on my laptop.

My Solution: The HorizSync and VertRefresh lines are added as shown:

Section "Monitor"
        Identifier "Generic Monitor"
        HorizSync 31.5-67
        VertRefresh 50-75
        Option "DPMS"
EndSection

Whether that's the optimum solution I don't know but it works. The HorizSync and
VertRefresh lines did not exist in Section "Monitor" before I entered them, and
only after adding in these lines did the picture on the screen extend to the
full screen.

The full contents of xorg.conf are shown below in case this helps:

# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the /etc/X11/xorg.conf manual page.
# (Type "man /etc/X11/xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

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

Section "Module"
        Load "GLcore"
        Load "i2c"
        Load "bitmap"
        Load "ddc"
        Load "dri"
        Load "extmod"
        Load "freetype"
        Load "glx"
        Load "int10"
        Load "type1"
        Load "vbe"
EndSection

Section "InputDevice"
        Identifier "Generic Keyboard"
        Driver "kbd"
        Option "CoreKeyboard"
        Option "XkbRules" "xorg"
        Option "XkbModel" "pc105"
        Option "XkbLayout" "gb"
EndSection

Section "InputDevice"
        Identifier "Configured Mouse"
        Driver "mouse"
        Option "CorePointer"
        Option "Device" "/dev/input/mice"
        Option "Protocol" "ImPS/2"
        Option "Emulate3Buttons" "true"
        Option "ZAxisMapping" "4 5"
EndSection

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

Section "Device"
        Identifier "Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset
Integrated Graphics Device"
        Driver "i810"
        BusID "PCI:0:2:0"
EndSection

Section "Monitor"
        Identifier "Generic Monitor"
        HorizSync 31.5-67
        VertRefresh 50-75
        Option "DPMS"
EndSection

Section "Screen"
        Identifier "Default Screen"
        Device "Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset
Integrated Graphics Device"
        Monitor "Generic Monitor"
        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 "Default Screen"
        InputDevice "Generic Keyboard"
        InputDevice "Configured Mouse"
        InputDevice "Synaptics Touchpad"
EndSection

Section "DRI"
        Mode 0666
EndSection