ça me lance system-config-display \o/
en revanche au démarrage j'ai toujours ce put*** d'écran noir......
EDIT : mon nouveau xorg.conf :
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "keyboard0" "CoreKeyboard0"
EndSection
Section "InputDevice"
# keyboard added by rhpxl
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbVariant" "latin9"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "radeon"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
en revanche en mettant vesa ça semble fonctionner....