Comment 27 for bug 1590590

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...