Matthias Grimm a écrit :
Because you wrote that the option changed nothing, I assume you have an USB trackpad. Unfortunately I have no idea how to configure this thing.
If it's the case and he uses synaptics, I would advise either : TouchpadOff 2 or TapButton1 0in /etc/X11/xorg.conf in the synaptics section. man synaptics for more details.