Enabled touchpad of Debian Squeeze/Sid on MacBook 5,2 white

below, my xorg.conf

# xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "Module"
     Load    "i2c"
     Load    "glx"
     Load    "synaptics"
EndSection

Section "InputDevice"
        Identifier      "Generic Keyboard"
        Driver          "kbd"
        Option          "XkbRules"      "xorg"
        Option          "XkbModel"      "pc104"
        Option          "XkbLayout"     "us"
EndSection

Section "InputDevice"
     Identifier      "Configured Mouse"
     Driver          "mouse"
     Option          "CorePointer"
     Option          "Device"                "/dev/input/mice"
     Option          "Protocol"              "ImPS/2"
     Option          "Emulate3Buttons"       "true"
EndSection

Section "InputDevice"
        Identifier      "Synaptics Touchpad"
        Driver          "synaptics"
        Option          "SendCoreEvents"        "true"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "auto-dev"
        Option          "SHMConfig"             "true"
        Option          "LeftEdge"              "100"
        Option          "RightEdge"             "1120"
        Option          "TopEdge"               "50"
        Option          "BottomEdge"            "310"
        #Option          "FingerLow"             "25"
        Option          "FingerLow"             "16"
        Option          "FingerHigh"            "30"
        Option          "FingerPress"           "256"
        Option          "VertScrollDelta"       "20"
        Option          "HorizScrollDelta"      "50"
        #Option          "MinSpeed"              "0.79"
        Option          "MinSpeed"              "0.8"
        #Option          "MaxSpeed"              "0.88"
        Option          "MaxSpeed"              "1.2"
        #Option          "AccelFactor"           "0.0015"
        Option          "AccelFactor"           "0.10"

        # exclusive grabbing of device
        #Option          "GrabEventDevice"       "1"
        # simulate right button
        #Option          "MultiFingerButton"     "2"
        # not using edge scrolling
        Option          "HorizEdgeScroll"       "0"
        Option          "VertEdgeScroll"        "0"
        # use two finger scrolling
        Option          "VertTwoFingerScroll"   "1"
        Option          "HorizTwoFingerScroll"  "1"
        # minimum pressure motion factor
        #Option          "PressureMotionMinZ"    "10"
        # palm detect
        #Option          "PalmDetect"             "0"
        #Option          "PalmMinWidth"           "10"
        #Option          "PalmMinZ"               "200"
        # tap times, change to suit your tapping habits
        #Option          "MaxTapMove"            "100"
        #Option          "MaxTapTime"            "223"
        #Option          "MaxDoubleTapTime"      "200"
        # don't change these or two finger tap stops working
        #Option          "TapButton2"            "3"
        #Option          "TapButton3"            "2"
        # must be commented out or normal tapping wont work
        #Option          "TapButton1"             "0"
        # not using corner buttons
        #Option          "RTCornerButton"         "0"
        #Option          "RBCornerButton"         "0"
        #Option          "LTCornerButton"         "0"
        #Option          "LBCornerButton"         "0"
EndSection

Section "Device"
     Identifier      "Cofigured Video Device"
     Driver          "nvidia"
#    BusID           "PCI:0:2:0"
#    Option          "UseFBDev"              "true"
#        Option "AccelMethod" "exa"
#        Option "AccelMethod" "xaa"
EndSection

Section "Monitor"
     Identifier      "MacBook 5,2 Monitor"
     Option          "DPMS"
EndSection

Section "Screen"
     Identifier      "Default Screen"
     Device          "Configured Monitor"
     Monitor         "MacBook 5,2 Monitor"
     DefaultDepth    24
     SubSection "Display"
             Modes           "1280x800" "1024x768" "800x600" "640x480"
     EndSubSection
EndSection

Section "ServerLayout"
     Identifier      "Default Layout"
     Screen          "Default Screen"
     InputDevice     "Generic Keyboard"
     InputDevice     "Configured Mouse"
     InputDevice     "Synaptics Touchpad"
EndSection

Section "ServerFlags"
     Option "AutoAddDevices" "false"
     Option "DontZap"        "false"
EndSection