J’ai pareil que toi. Donc ca ne vient pas de là.
Voici mon fichier (suggéré par Mattotop à l’époque):
Section "ServerLayout"
Identifier "Layout manuel avec config fine"
Screen 0 “Screen manuel avec config fine” 0 0
InputDevice "Clavier"
InputDevice "Souris"
EndSection
Section “Files”
# local font server
# if the local font server has problems, we can fall back on these
FontPath "unix/:7100"
FontPath "/usr/lib/X11/fonts/misc"
FontPath "/usr/lib/X11/fonts/cyrillic"
FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/lib/X11/fonts/Type1"
FontPath "/usr/lib/X11/fonts/CID"
FontPath "/usr/lib/X11/fonts/100dpi"
FontPath "/usr/lib/X11/fonts/75dpi"
EndSection
Section "Module"
Load "bitmap"
Load "dbe"
Load "ddc"
Load "dri"
Load "evdev"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "record"
Load "type1"
Load "record"
Load "type1"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Clavier"
Driver "keyboard"
Option "CoreKeyboard"
Option “XkbRules” "xorg"
Option "CoreKeyboard"
Option “XkbRules” "xorg"
Option “XkbModel” "pc105"
Option “XkbLayout” "fr"
Option “XkbVariant” "latin9"
EndSection
Section "InputDevice"
Identifier "Souris"
Driver "mouse"
Option "CorePointer"
Option “Device” "/dev/input/mice"
Option “Protocol” "ImPS/2"
Option “Emulate3Buttons” "true"
Option “ZAxisMapping” "4 5"
EndSection
Section "Monitor"
Identifier "4311 FA"
HorizSync 30.0 - 70.0
VertRefresh 50.0 - 160.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Carte ATI"
Driver "fglrx"
BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Screen manuel avec config fine"
Device "Carte ATI"
Monitor "4311 FA"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes “1280x1024” “1024x768” “800x600” “720x400” "640x480"
EndSubSection
EndSection
Section "DRI"
Mode 0666
EndSection