Configure composite in xorg

Question

Trying to configure gnome-do to look like a docklet I have a message saying me that xorg must be configured to use compositing.
this is my xorg.conf:
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 1.0  (buildmeister@builder58)  Wed Dec  9 16:34:26 PST 2009
Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
    Load           "dri"
EndSection
Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection
Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection
Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection
Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "renderAccel" "True"
    Option         "AddARGBGLXVisuals" "True"
    SubSection     "Display"
        Depth       24
#        Modes      "1440x900"
    EndSubSection
EndSection
Section "Extensions"
    Option         "Composite" "Enable"
EndSection
How to change it to activate composite? I tried various solution suggested in the wiki, but nothing.
PS: I don't know if it's important but also fusion icon doesn't work. When I launch it the windows loose the highest part, the one with the buttons.

Answer 1

Most of the necessary options are enabled by default now. In fact, a good chunk of your config file is obsolete, you should no longer need sections for your input devices either (they're handled by HAL and fdi files).
Just for the sake of clarity, here's my xorg conf
Section "Device"
Identifier "Device0"
Driver "nvidia"
Option "NoLogo" "true"
Option "RenderAccel" "true"
Option "TripleBuffer" "true"
Option "RandRRotation" "true"
Option "TwinView" "true"
EndSection
That's it. That's my entire xorg.conf file now. This supports my dual DVI screens too.
I've just had a thought - I haven't used compiz in years, but I remember way back when I did, it would sometimes crash the window manager (this would cause you to lose your window decorations, as you describe). I think there's a window manager with compiz, though I forget its name. You could probably run the command manually in a console to launch it after you enable fusion. Hopefully someone here will chip in with the answer.
Last edited by steven (2010-03-11 00:51:11)