Un petit dernier pour ne pas rester sur notre faim. Mais c'est un pb de modeline. C'est toujours casse pied à trouver, mais quand c'est fait...
Bonne soirée !

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbVariant" "latin9"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection

Section "Device"
Identifier "Configured Video Device"
Driver "vesa"
#Driver "ati"
#Option "IgnoreEDID" "true"
EndSection

Section "Monitor"
Identifier "Monitor0"
Option "DPMS"
HorizSync 30-81
VertRefresh 56-60
Modeline "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
# Option "PreferredMode" "1680x1050_60.00"
EndSection

Section "Screen"
Identifier "Screen0"
Monitor "Monitor0"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1680x1050"
EndSubSection
SubSection "Display"
Depth 24
Modes "1680x1050"
EndSubSection
EndSection