Résolution de X sous Ubuntu

Bonsoir,

J'ai récemment installé Ubuntu sur mon PC, j'en suis pour le moment content bien que plutôt habitué à Fedora jusqu'alors.

Le problème est que X me propose que 3 résolutions 640x480, 800x600 et 1024x768. J'ai un écran plat 17 pouces, dont la résolution normale est 1152x864. Je trouve que 1024x768 ne convient pas donc j'ai voulu changer.

J'ai essayé de simplement rajouter "1152x864" dans xorg.conf, ce qui n'a strictement rien changé.

J'ai ensuite essayé un dpkg-reconfigure xserver-xorg, qui s'est executé jusqu'au bout, j'ai pu choisir d'ajouter 1152x864 dans la liste. Au redémarrage, plus d'interface graphique, impossible de démarrer X. Résultat j'ai du remettre l'ancien fichier de configuration, ce qui ne résout pas tellement le problème...

Le driver de la carte graphique (GeForce 2) est installé et utilisé par X.

Voici mon fichier de configuration /etc/X11/xorg.conf

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildd@rothera)  Thu Jan  5 15:32:31 UTC 2006

# /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 xorg.conf(5) manual page.
# (Type "man 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 "ServerLayout"
    Identifier     "Default Layout"
    Screen         "Default Screen" 0 0
    InputDevice    "Generic Keyboard"
    InputDevice    "Configured Mouse"
    InputDevice    "stylus" "SendCoreEvents"
    InputDevice    "cursor" "SendCoreEvents"
    InputDevice    "eraser" "SendCoreEvents"
EndSection

Section "Files"

	# path to defoma fonts
    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"
    FontPath        "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
    Load           "i2c"
    Load           "bitmap"
    Load           "ddc"
    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"
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"
    Identifier     "stylus"
    Driver         "wacom"
    Option         "Device" "/dev/input/wacom"
    Option         "Type" "stylus"
    Option         "ForceDevice" "ISDV4"		# Tablet PC ONLY
EndSection

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

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

Section "Monitor"
    Identifier     "Generic Monitor"
    HorizSync       28.0 - 51.0
    VertRefresh     43.0 - 60.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "nVidia Corporation NV15DDR [GeForce2 Ti]"
    Driver         "nvidia"
EndSection

Section "Screen"
    Identifier     "Default Screen"
    Device         "nVidia Corporation NV15DDR [GeForce2 Ti]"
    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

Si quelqu'un peut m'aider, je lui en serais bien reconnaissant :)

Merci d'avance.

Cralon