Great news, yesterday the i2c Linux kernel drivers from Synaptics made it upstream and are in the proposed repository. This is relevant for those Sputnik 3 users who have upgraded from Ubuntu 12.04 to either 13.10 or 14.04 LTS.
If you want to start kicking the tires before the drivers hit updates, you can enable the proposed repository and get to the test kernels by following the instructions here:
What the issue was
From 13.10 on there is better i2c support and since there weren’t any drivers, this caused the touchpad to operate in very basic i2c mode, meaning no multi-touch, tap-to-click, scrolling, etc. Users were either left with a minimally-functional touchpad in i2c mode, or they had to end up blacklisting the i2c-hid modules as a workaround so the touchpad would come up in psmouse mode and operate similar to how it did in 12.04.
Canonical, who has been instrumental in this whole process, is also doing their best to try and backport this functionality into 14.04 LTS so that users can take advantage of native i2c touchpad support.
I would like to give big shout outs to Synaptics, Canonical and Kent Baxley from Canonical for making this happen!!
Pau for now….