The same is true for my Acer Aspire 3633 laptop. For this laptop, adding
this (with the appropriate ServerLayout entry) is the solution:

Section "InputDevice"
        Identifier      "TouchPad"
        Driver          "synaptics"
        Option          "AlwaysCore"
        Option          "Device"                "/dev/input/mice"
        Option          "Protocol"              "auto-dev"
        Option  "LeftEdge"      "1700"
        Option  "RightEdge"     "5300"
        Option  "TopEdge"       "1700"
        Option  "BottomEdge"    "4200"
        Option  "FingerLow"     "25"
        Option  "FingerHigh"    "30"
        Option  "MaxTapTime"    "180"
        Option  "MaxTapMove"    "220"
        Option  "VertScrollDelta" "100"
        Option  "MinSpeed"      "0.09"
        Option  "MaxSpeed"      "0.18"
        Option  "AccelFactor"   "0.0015"
        Option  "SHMConfig"     "on"
        Option  "FastTaps"      "on"
        Option  "Emulate3Buttons" "on"
EndSection

If additional information would be useful (hardware IDs or so), feel
free to drop me a line.

-- 
Synaptics touchpad not configured in xorg.conf on Samsung X20
https://launchpad.net/bugs/47925

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