Verified with 201610-25182, this bug can be fixed after installing the proposed 
kernel.
I can tap with 4-fingers and it's still working properly.

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Committed

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https://bugs.launchpad.net/bugs/1633321

Title:
  Fix alps driver for multitouch function.

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  We need to cherry-pick 9a54cf462d6f3c383a5a4f5fe15c020a03db44e6 for
  alps touchpads. Otherwise the touchpad will stop working when we put
  more than 3 fingers on the pad.

  Please consider SRU this commit.

  Impact:
    Alps driver doesn't work when users put more than 3 fingers on it.
    
  Fix:
    Alps touchpad still works good after multitouch for more than 3 fingers.

  Tested:
    The patch is tested on new Dell Inspiron laptops and works very good.

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