Comment 35 for bug 967399

I've already posted my solution for this in Bug #1070207 which seems to be a duplicate of this bug.

No need to recompile the kernel, just use DKMS :)

Can confirm that this bug still exists on Lenovo L430/L530 with Ubuntu 14.10

https://drive.google.com/file/d/0ByR4ekc5XtmPTWxQUkdZWkt2YXM/view?usp=sharing

The link points to a dkms tar.gz with a backported elantech driver from the current 3.18 kernel (that has the the fix for the issue included).

I call it "backported" as it was _slightly_ changed.
__set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit); had to be commented out in elantech.c as kernel 3.16 doesn't support the INPUT_PROP_POINTING_STICK bit.

Apart from elantech.c and elantech.h everything else was coppied from the latest 3.16 ubuntu kernel sources.

This has been tested with ubuntu 14.10, *should* be compatible with ubuntu 14.04 (not tested)

TL;DR:
Download https://drive.google.com/file/d/0ByR4ekc5XtmPTWxQUkdZWkt2YXM/view?usp=sharing
sudo apt-get install dkms
sudo dkms ldtarball psmouse-elantech-3-18.tar.gz
sudo dkms install -m psmouse -v elantech-3-18
sudo rmmod psmouse
sudo modprobe psmouse