Voici mon fichier xorg.conf avec les modifications.
# Xorg configuration created by system-config-display
Section "ServerLayout"
Identifier "single head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "fr"
Option "XkbVariant" "latin9"
EndSection
Section "InputDevice"
Identifier "USB Mouse"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/input/mice"
Option "Emulate3Buttons" "no"
Option "Buttons" "5"
Option "ZAxisMapping" "4 5"
Option "ButtonMapping" "1 2 3 7 6"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "radeon"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1280x960" "1280x800" "1280x720" "1152x864" "1152x768" "1024x768" "800x600" "640x480"
EndSubSection
EndSection
Par contre pour les logs je ne comprends pas ils sont vide (du moins dans le viewer) mais par conre voici la ligne dans le terminal :
-rw-r--r-- 1 root root 58556 déc 28 13:38 Xorg.0.log
et un grand Merci pour ton aide !!!!!