Upstream reports that touchpads on some 2015 Lenovo laptops will need the
following patches to work:

> commit cdd9dc195916ef5644cfac079094c3c1d1616e4c
> Author: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Date:   Sun Mar 8 22:35:41 2015 -0700
> 
>     Input: synaptics - re-route tracksticks buttons on the Lenovo 2015 series
> 
> A relatively extensive patch, but otherwise those touchpads
> are not usable
> 
> commit 3adde1f59195df2965f632e22b31f97fb371612f
> Author: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Date:   Sun Mar 8 22:34:50 2015 -0700
> 
>     Input: synaptics - remove TOPBUTTONPAD property for Lenovos 2015
> 
> Necessary for these laptops to have a working touchpad

> commit 06aa374bc70468b517dd36b95c48c8f391c08a27
> Author: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Date:   Sun Mar 8 22:34:03 2015 -0700
> 
>     Input: synaptics - retrieve the extended capabilities in query $10
> 
> Necessary for laptops with such touchpads