Comment 82 for bug 1653456

Update2: Problem was due to the Touchpad Indicator Gnome extension which automatically disables the touchpad when a mouse is plugged in (in my case it was just the Unifying Receiver, regardless if a mouse is actually connected). Once I unplugged the receiver, the touchpad functioned normally. Given that the Fn+Touchpad-toggle key is not functional, I have no easy way to re-enable the touchpad when it's locked by the indicator extension (which is what I was used to do in my previous G751 model).