Enable/disable touchpad

[Timothy Murphy]

I'm running Fedora-22/KDE on my ThinkPad T510.
Ctrl-Y turns off the touchpad on this laptop.
But this only works until the next re-boot.

In System Settings=>Hardware=>Input Devices=>Touchpad
there is an option "Enable/Disable Touchpad"
which I assume is meant to toggle the touchpad on and off.
On my machine it seems to have no effect.
Have I misunderstood its purpose?
Or does one have to install some other package for it to work?

As I recall, there was a straightforward option "Disable touchpad"
in Fedora-21/KDE, which worked perfectly.

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin