bonjour,
sauvegarde ton fichier xorg.conf en le renommant puis essaie un fichier xorg.conf simple en vesa comme par exemple:
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/100dpi"
FontPath "/usr/share/X11/fonts/75dpi"
EndSection
Section "Module"
# Load "i2c"
# Load "bitmap"
# Load "ddc"
# Load "dri" ## direct rendering
# Load "extmod"
# Load "freetype"
# Load "glx" ## client GLX pour OpenGL
# Load "int10"
# Load "type1"
# Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
# Option "XkbVariant" "latin9"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "Device" "/dev/input/mice"
Option "Protocol" "Auto"
EndSection
Section "Device"
Identifier "Carte"
Driver "vesa" ## nv pour les NVIDIA (libre), ati pour les ATI (libre).
# BusID "PCI:1:0:0"
EndSection
Section "Monitor"
Identifier "Moniteur"
Option "DPMS"
## HorizSync 31-60 ## selon vos valeurs, n'est pas toujours nécéssaire.
## VertRefresh 47.5-125 ## voir [
www.monitorworld.com]
EndSection
Section "Screen"
Identifier "Ecran"
Device "Carte"
Monitor "Moniteur"
DefaultDepth 24
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 "Ecran"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection