It looks like the following commit is intended to be the fix for this:
commit aa972409951e0675e07918620427517cad5090e0 Author: Dmitry Torokhov <email address hidden> Date: Tue Sep 2 09:49:18 2014 -0700
Input: synaptics - gate forcepad support by DMI check
It looks like the following commit is intended to be the fix for this:
commit aa972409951e067 5e0791862042751 7cad5090e0
Author: Dmitry Torokhov <email address hidden>
Date: Tue Sep 2 09:49:18 2014 -0700
Input: synaptics - gate forcepad support by DMI check