I had a similar problem on my Acer Ferrari 4005 WLMi. I added the FingerHigh and FingerLow options to the InputDevice section as follows:
Section "InputDevice" Identifier "Synaptics Touchpad" Driver "synaptics" Option "SendCoreEvents" "true" Option "Device" "/dev/psaux" Option "Protocol" "auto-dev" Option "HorizScrollDelta" "0" Option "SHMConfig" "on" Option "FingerHigh" "40" Option "FingerLow" "20" EndSection -- synaptics touch pad(laptop) clicks when i dont want it to https://launchpad.net/bugs/47971 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs