this commit in mainline should have fixed it:

commit 3808843cf10e4a696d942359d99822eff1a2de8e
Author: Yunkang Tang <[email protected]>
Date:   Sat Jul 26 13:51:41 2014 -0700

    Input: alps - add support for v7 devices

    Such as found on the new Toshiba Portégé Z30-A and Z40-A.

    Signed-off-by: Yunkang Tang <[email protected]>
    [[email protected]: Remove softbutton handling, this is done in userspace]
    [[email protected]: Report INPUT_PROP_BUTTONPAD]
    [[email protected]: Do not report fake PRESSURE, reporting BTN_TOUCH is
     enough]
    [[email protected]: Various cleanups / refactoring]
    Signed-off-by: Hans de Goede <[email protected]>
    Signed-off-by: Dmitry Torokhov <[email protected]>


** Changed in: linux-lts-utopic (Ubuntu)
       Status: New => In Progress

** Changed in: linux-lts-utopic (Ubuntu)
   Importance: Undecided => High

** Changed in: linux-lts-utopic (Ubuntu)
     Assignee: (unassigned) => Adam Lee (adam8157)

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https://bugs.launchpad.net/bugs/1433941

Title:
  [Lenovo E450] [ALPS touchpad] Multi-touch function of touchpad is
  useless after 14.04.2 installed.

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