Arrancar GNOME a 1024x768 y 60 Hz en Feisty 7.04

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Tengo un ordenador con Ubuntu 7.04 Feisty. Cuando arranco el equipo, llega a la ventana de login gráfico, y aparece todo en negro. La resolución se pone automáticamente a 1280x768 (Esto lo puedo verificar conectando otro monitor en este momento). ÉSte monitor va bien como máximo 1024x768 y 60Hz.
Puedo pasar el login, a ciegas, y luego ya entra en un usuario que tiene configurada la resolución correcta y se puede trabajar.
¿Cómo puedo hacer para que la pantalla de login esté a 1024x768 y 60 Hz al arrancar?
He modificado el xorg.conf, borrando todas las entradas con "1280x1024" pero nada.

Adjunto el fichero xorg.conf:

--------------------------------------------------------------------

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

Section "Module"
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" "es"
Option "XkbVariant" "cat"
EndSection

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

Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Device" "/dev/input/wacom"
Option "Type" "stylus"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/wacom"
Option "Type" "eraser"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/wacom"
Option "Type" "cursor"
Option "ForceDevice" "ISDV4" # Tablet PC ONLY
EndSection

Section "Device"
Identifier "Intel Corporation 82865G Integrated Graphics Controller"
Driver "i810"
BusID "PCI:0:2:0"
EndSection

Section "Monitor"
Identifier "776s"
Option "DPMS"
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation 82865G Integrated Graphics Controller"
Monitor "776s"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "832x624" "800x600" "720x400" "640x480" "1x1"
EndSubSection
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
InputDevice "stylus" "SendCoreEvents"
InputDevice "cursor" "SendCoreEvents"
InputDevice "eraser" "SendCoreEvents"
EndSection

Section "DRI"
Mode 0666
EndSection