~/.xinitrc

# the following variable defines the session which is started if the user
# doesn't explicitely select a session

DEFAULT_SESSION=openbox-session

#OPTS=ck-launch-session dbus-launch --exit-with-session
OPTS=ck-launch-session

# Inicia o dbus-session
source /etc/X11/xinit/xinitrc.d/30-dbus

# Inicia o MATE Keyring
/usr/bin/mate-keyring-daemon --start --components=gpg,pkcs11,secrets,ssh

case $1 in
    mate)
        exec $OPTS mate-session
        ;;
    xfce)
        exec $OPTS startxfce4
        ;;
    gnome)
        exec $OPTS gnome-session
        ;;
    kde)
        exec $OPTS startkde
        ;;
    openbox)
        exec $OPTS openbox-session
        ;;
    subtle)
        exec $OPTS subtle
        ;;
    *)
        exec $OPTS $DEFAULT_SESSION
        ;;
esac