Ok. Making some progress, here.

With the new hwdb update it looks as if the hotkey does respond, but,
not like one would expect :-)   The touchpad hotkey now behaves like it
did in the past before we put the keyboard-force-release rules in place.
i.e., things appear to get 'stuck' whenever we press the hotkey.

Here's what I observed my Latitude:

1) Press touchpad hotkeys (Fn+F5 in this case).
2) It appears to have no effect
3) Try to type something into the terminal with the keyboard. Nothing happens.
4) Reboot.
5) Upon logging back in, we regain use of the keyboard but the touchpad is 
disabled. 
6) Press the touchpad hotkeys again. The touchpad doesn't come back and we lose 
control of the keyboard again.
7) Reboot again and the touchpad and keyboard start working. 

With the new packages, can we just put the old rules back in for this or
will something new have to be cooked up?

Thanks for your help!

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https://bugs.launchpad.net/bugs/1218433

Title:
  Latest systemd updates break touchpad disable hotkey on Dell laptops

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