[Lenovo X250] The left, middle and right button of touchpad are useless after 14.04.2 installed

[Gabriel Zhi Chen]

Steps:
1. Install 14.04.2 on Lenovo X250
2. Try to use the left, middle and right button of touchpad.

Expected result:
The keys work normally.

Actual result:
The left, middle and right button of touchpad are useles

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-31-generic 3.16.0-31.41~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-31.41~14.04.1-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 12 02:58:43 2015
InstallationDate: Installed on 2015-03-11 (1 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)

[Gabriel Zhi Chen (gabrielzchen)]

There is a similar bug <https://bugs.launchpad.net/hwe-next/+bug/1396429>

[Timo Aaltonen (tjaalton)]

this depends on https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1414930

so utopic kernel needs the patch set too