gadget@tarro:~> compiz --replace
compiz: Trying '/usr/$LIB/libIndirectGL.so.1'
compiz (core) - Fatal: No GLXFBConfig for default depth, this isn't going to work.
compiz (core) - Error: Failed to manage screen: 0
compiz (core) - Fatal: No manageable screens found on display :0.0


here's my xorg.conf:

Section "Module"
  Load         "dbe"
  Load         "type1"
  Load         "freetype"
  Load         "extmod"
  Load         "glx"
EndSection

Section "InputDevice"
  Driver       "kbd"
  Identifier   "Keyboard[0]"
  Option       "Protocol" "Standard"
  Option       "XkbLayout" "es"
  Option       "XkbModel" "pc102"
  Option       "XkbRules" "xfree86"
EndSection


Section "InputDevice"
  Driver       "synaptics"
  Identifier   "Mouse[1]"
  Option       "Buttons" "5"
  Option       "Device" "/dev/input/mice"
  Option       "Emulate3Buttons" "on"
  Option       "InputFashion" "Mouse"
  Option       "Name" "Synaptics;Touchpad"
  Option       "Protocol" "explorerps/2"
  Option       "SHMConfig" "on"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[3]"
  Option       "Buttons" "5"
  Option       "Device" "/dev/input/mice"
  Option       "Name" "ImPS/2 Generic Wheel Mouse"
  Option       "Protocol" "explorerps/2"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection


Section "Monitor"
  Option       "CalcAlgorithm" "XServerPool"
  DisplaySize  305 230
  HorizSync    31-60
  Identifier   "Monitor[0]"
  ModelName    "1024X768@60HZ"
  Option       "DPMS"
  VendorName   "--> LCD"
  VertRefresh  30-60
  UseModes     "Modes[0]"
EndSection


Section "Modes"
  Identifier   "Modes[0]"
  Modeline 	"1024x768" 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
EndSection


Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      15
    Modes      "1024x768" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1024x768" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "1024x768" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "1024x768" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection


Section "Device"
  BoardName    "GeForce 7000M / nForce 610M"
  BusID        "0:18:0"
  Driver       "nvidia"
  Identifier   "Device[0]"
  VendorName   "NVIDIA"
EndSection



Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[1]" "CorePointer"
  InputDevice  "Mouse[3]" "SendCoreEvents"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection


Section "DRI"
    Group      "video"
    Mode       0660
EndSection

Section "Extensions"
   Option "Composite"
EndSection