First, why is it when I press fn+f5 that my touchpad doesn't shut off, even though Gnome 3 says it did in its indicator pop-up?
EDIT: After upgrade to 16.04, problem persists. Crap.
I have the same problem with GNOME on Arch Linux on my Latitude E7240. The touchpad is not disabled while typing and I'm unable to disable it with Fn + F5, although it shows HUD indicators that the touchpad was disabled/enabled it's always enabled.