user35553 is right, setting the FingerHigh
and FingerLow
values via synclient
should produce the effect you're after.
synclient
is a convenient way to play around with the various options the Synaptics driver offers, but if you’re happy with your changes, you’ll probably want to make them permanent for all users rather than running synclient
manually or at login.
Normally you'd do that via the xorg.conf file, but Ubuntu, along with several other distros, has effectively deprecated the use of xorg.conf
in favour of device-specific scripts inside /usr/share/X11/xorg.conf.d
. You may or may not have this directory, and if you do, you may or may not already have a file inside it called 50-synaptics.conf
. Create the directory if necessary, then open the file (substituting gedit for your editor of choice):
sudo mkdir /usr/share/X11/xorg.conf.d
sudo gedit /usr/share/X11/xorg.conf.d/50-synaptics.conf
Edit the file to include Option lines that set your desired FingerHigh and FingerLow values. Mine looks like this:
Section "InputClass"
Identifier "touchpad catchall"
Driver "synaptics"
MatchIsTouchpad "on"
MatchDevicePath "/dev/input/event*"
Option "FingerLow" "10"
Option "FingerHigh" "16"
EndSection
Save the file, and when you restart, your new settings will apply everywhere in X.