got from this http://ubuntuforums.org/showthread.php?t=2020719&page=4
this solution works on Mint 14 (Ubuntu 12.10, linux version 3.5.0-21.32), and also with this solution scroll can be enabled.. just create a file:
/etc/modprobe.d/blacklist-acer.conf
containing this line:
blacklist acer-wmi
in terminal:
sudo modprobe -r psmouse
sudo modprobe psmouse
this solution works on 3.5.0-17.28, without needing to do steps above, just create a file:
/etc/X11/xorg.conf
containing:
Section "InputClass"
Identifier "ETPS/2 Elantech Touchpad"
MatchProduct "ETPS/2 Elantech Touchpad"
MatchDevicePath "/dev/input/event*"
Driver "synaptics"
Option "TapButton1" "1"
Option "TapButton2" "3"
Option "TapButton3" "2"
Option "VertTwoFingerScroll" "1"
Option "HorizTwoFingerScroll" "1"
Option "CoastingSpeed" "10"
Option "EdgeMotionMinZ" "30"
Option "EdgeMotionMaxZ" "40"
Option "EdgeMotionMinSpeed" "100"
Option "EdgeMotionMaxSpeed" "400"
Option "FingerLow" "9"
Option "FingerHigh" "12"
Option "EmulateMidButtonTime" "0"
Option "ClickPad" "True"
Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0"
EndSection
then, reboot..