It looks like the following commit is intended to be the fix for this:
commit aa972409951e0675e07918620427517cad5090e0
Author: Dmitry Torokhov <[email protected]>
Date: Tue Sep 2 09:49:18 2014 -0700
Input: synaptics - gate forcepad support by DMI check
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https://bugs.launchpad.net/bugs/1381815
Title:
left touchpad button stopped working in 3.16.0-22.19
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