Bisected kernel, see below (where 'bad' means feature introduced and
functional)

aeaa881f9b17823028b464893b89c42db797b717 is the first bad commit
commit aeaa881f9b17823028b464893b89c42db797b717
Author: Ben Gamari <b...@smart-cactus.org>
Date:   Tue Oct 4 11:43:30 2016 -0700

    Input: ALPS - set DualPoint flag for 74 03 28 devices
    
    Here we introduce logic in alps_identify to set the ALPS_DUALPOINT flag
    for touchpad hardware responding to E7 report with 73 03 28, as is found
    in the Dell Latitude E7470.
    
    Tested-by: Michal Hocko <mho...@suse.com>
    Signed-off-by: Ben Gamari <b...@smart-cactus.org>
    Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>

:040000 040000 9e51f288b78352b4b7fca18f5e5f379cd1d4b90a
3b7eafa43208c2a7046be9d17f748fcd5dba18d8 M      drivers


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

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https://bugs.launchpad.net/bugs/1641451

Title:
  ALPS Touchpad incorrectly detected as PS/2 mouse in Dell Latitude 7370

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