Bonjour,
J’ai (aussi) un problème avec Compiz, j’ai suivi les différents tutos disponibles et lorsque je lance compiz avec la console (compiz --replace–) il ne se passe rien et gnome se fige, freeze total.
seul un Ctrl+Alt+Backspace permet de sortir de la chose.
Voici mon Xorg.conf :
[code]Section "Files"
FontPath "/usr/share/fonts/X11/misc"
FontPath "/usr/X11R6/lib/X11/fonts/misc"
FontPath "/usr/share/fonts/X11/cyrillic"
FontPath "/usr/X11R6/lib/X11/fonts/cyrillic"
FontPath "/usr/share/fonts/X11/100dpi/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/:unscaled"
FontPath "/usr/share/fonts/X11/75dpi/:unscaled"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/:unscaled"
FontPath "/usr/share/fonts/X11/Type1"
FontPath "/usr/X11R6/lib/X11/fonts/Type1"
FontPath "/usr/share/fonts/X11/100dpi"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi"
FontPath "/usr/share/fonts/X11/75dpi"
FontPath “/usr/X11R6/lib/X11/fonts/75dpi”
# path to defoma fonts
FontPath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection
Section "Module"
Load "i2c"
Load "bitmap"
Load “ddc”
# Load "dri"
Load "extmod"
Load "freetype"
Load "glx"
Load "int10"
Load "type1"
Load "vbe"
EndSection
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "CoreKeyboard"
Option “XkbRules” "xorg"
Option “XkbModel” "pc105"
Option “XkbLayout” "fr"
Option “XkbVariant” "latin9"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option “Device” "/dev/input/mice"
Option “Protocol” "ImPS/2"
Option “Emulate3Buttons” "true"
EndSection
Section "Device"
Identifier "nVidia Corporation NV18 [GeForce4 MX - nForce GPU]"
Driver "nvidia"
BusID "PCI:1:0:0"
Option “RenderAccel” "true"
Option “backingstore” "true"
Option “AllowGLXWithComposite” "true"
Option “AddARGBGLXVisuals” “True”
EndSection
Section "Monitor"
Identifier "Écran générique"
Option "DPMS"
HorizSync 28-51
VertRefresh 43-100
EndSection
Section "Screen"
Identifier "Default Screen"
Device "nVidia Corporation NV18 [GeForce4 MX - nForce GPU]"
Monitor "Écran générique"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes “1024x768” “800x600” "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes “1024x768” “800x600” "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes “1024x768” “800x600” "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes “1024x768” “800x600” "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes “1024x768” “800x600” "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes “1024x768” “800x600” "640x480"
EndSubSection
Option “AddARGBGLXVisuals” "True"
EndSection
Section "ServerLayout"
Identifier "Default Layout"
Screen "Default Screen"
InputDevice "Generic Keyboard"
InputDevice "Configured Mouse"
EndSection
Section "DRI"
Mode 0666
EndSection
Section "Extensions"
Option “Composite” "Enable"
EndSection[/code]
Le pilote nvidia se charge bien , j’ai le logo nvidia au démarrage de X
Je sais que Compiz ne sert à rien, qu’il est gourmand en mémoire, mais je dormirai mieux la nuit lorsque je l’aurai fait tourner une fois sur Debian 
Merci !