Compiz

Installation of AIGLX

http://wiki.debian.org/Compiz

Add the following options to the corresponding sections in the file /etc/X11/xorg.conf:

 Section "ServerLayout"
         Option "AIGLX" "true"
 EndSection
 
 Section "Extensions"
         Option "Composite" "enable"
 EndSection
 
 Section "Device"
         Option "XAANoOffscreenPixmaps" "true"
 EndSection

Nvidia user may also need:

 Section "Device"
         Option "AllowGLXWithComposite" "true"
 EndSection
 
 Section "Screen"
         Option "AddARGBGLXVisuals" "True"
 EndSection
 
 Section "Module"
         #Load "dri"
         #Load "GLcore"
 EndSection

Activation for KDE / Xfce4

http://www.mail-archive.com/debian-user-french@lists.debian.org/msg130812.html

First edit the file /etc/xdg/xfce4-session/xfce4-session.rc and comment the lines regarding xfwm4 :

1. Client0_Command=xfwm4
2. Client0_PerScreen=False

Secondly, you must create a file ~/.config/autostart/compiz.desktop taking care of compiz start :

Desktop Entry Name=No name Encoding=UTF-8 Version=1.0 Exec=compiz --replace --fast-filter --use-cow X-GNOME-Autostart-enabled=true