Teste pour voir ce fichier xorg.conf:
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Synaptics" "CorePointer"
EndSection
Section "Files"
EndSection
Section "ServerFlags"
Option "AIGLX" "false"
EndSection
#Section "Module"
# Load "glx"
# Load "dri"
#EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbVariant" "latin9"
EndSection
Section "InputDevice"
Identifier "Synaptics"
Driver "synaptics"
Option "Device" "/dev/input/mice"
Option "Protocol" "auto-dev"
Option "Emulate3Buttons" "yes"
EndSection
Section "Monitor"
### Comment all HorizSync and VertSync values to use DDC:
Identifier "Monitor0"
ModelName "LCD Panel "
# HorizSync 31.5 - 90.0
# VertRefresh 59.9 - 60.1
Option "dpms"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "fglrx"
Option "DesktopSetup" "single"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x960" "1280x800" "1152x864" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "disable"
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection
j'ai laissé expres le driver fglrx, si jamais ca buggait, remplace "fglrx" par "vesa" tel que celui que tu as là, qui lui, démarre toujours.
Déjà on va voir si tu arrives à avoir une autre résolution