Confirming this behavior with Dell Latitude 7370, 
Kernel 4.8.4-040804-generic

When typing in basically turn off my touchpad. 
With  $ xinput find your device id
$ xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ImPS/2 BYD TouchPad                       id=12   [slave  pointer  (2)]
⎜   ↳ ThinkPad Bluetooth Laser Mouse            id=15   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]

TouchPas a id 12

Then disable touchpad with:
xinput set-prop 12 "Device Enabled" 0

When done typing, reenable it with
xinput set-prop 12 "Device Enabled" 1

Clumsy but better than dealing with jumping cursors...

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-input-synaptics in Ubuntu.
https://bugs.launchpad.net/bugs/1590590

Title:
  Touchpad not recognized on Dell Latitude E7470 Ultrabook

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1590590/+subscriptions

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