$> cat /usr/share/xsessions/compiz.desktop[Desktop Entry]Encoding=UTF-8Name=CompizComment=This session logs you into GNONE with Compiz enabledExec=/usr/local/bin/compiz.sh# no icon yet, only the top three are currently usedIcon=Type=ApplicationX-Ubuntu-Gettext-Domain=gnome-session-2.0$> cat /usr/local/bin/compiz.sh#!/bin/sh# $Revision: 1.3 $# Luis Mondesi < lemsx1@gmail.com >## DESCRIPTION: A script to start a gnome session under gdm with Compiz+gnome-window-decorator#EOF# USAGE: compiz.sh# LICENSE: GPL# NOTES:# * http://lems.kiskeyix.org/puntoyaparte/index.php?story_id=58# * https://wiki.ubuntu.com/XglHowto# * https://wiki.nurd.se/global:howto:xgl:session# * Assumes that you are creating a file named:##> cat > /usr/share/xsessions/compiz.desktop <<EOF#[Desktop Entry]#Encoding=UTF-8#Name=Compiz#Comment=This session logs you into GNONE with Compiz enabled#Exec=/usr/local/bin/compiz.sh## no icon yet, only the top three are currently used#Icon=#Type=Application#X-Ubuntu-Gettext-Domain=gnome-session-2.0#EOF# # Now, in gdm.conf-custom you need:##> cat /etc/gdm/gdm.conf-custom# [server-Standard]# name=Xgl server# command=/usr/bin/Xgl -fullscreen -ac -accel xv -accel glx:pbuffer# flexible=true# # NOTE thatt :1 is not needed here as gdm will do that for you in the following# line.## And finally, in /etc/gdm/gdm.conf you need to change:# 0=Standard to 1=Standard:##0=Standard#1=Standard## Now when gdm start, make sure you select your new "compiz" session#MY_DISPLAY=:0# assumes Xgl was launched as:#Xgl $MY_DISPLAY -ac -accel xv -accel glx:pbuffer -fullscreen &# and since that takes a little while to load, we sleep for 5 seconds...#sleep 2# ATI's drivers couldn't start Xgl on :0.0 because the driver wrongly attempts # to open :0.0 even if the display is set to :93.0 (as Xgl does by default)# so, we force the whole thing to go to :1.0 as defined in MY_DISPLAYif [ -z "$DISPLAY" -o "x$DISPLAY" = "x:0" -o "x$DISPLAY" = "x:0.0" ]; then DISPLAY=$MY_DISPLAY export DISPLAYfignome-window-decorator &sleep 1compiz --replace gconf # no need to background this. it will do it alonesleep 1# this is the proper way to start gnome-session. We need ssh-agent and dbus-launch first#/usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session exec /usr/bin/gnome-session