My Acer Timeline has a "Disable touchpad button" which works too well. That is, once I've pressed it, pressing it again won't re-enable the touchpad. I've tried a couple of things like:
gconftool-2 --set --type boolean /desktop/gnome/peripherals/touchpad/touchpad_enabled true
which worked once, but now when I do it again, it doesn't work again...
In fact, I'd like to know how to work out what the "disable touchpad" button is actually doing, and why doing it again isn't fixing the issue.