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On a dell inspiron 13 7000, I had set the touchpad config (in KDE control
module) to turn the touchpad off whenever an external mouse is connected.
However, this didn't seem to have an effect despite receiving a notification
saying "Touchpad was disabled because a mouse was plugged in.".

Initially submitted this as a question in the forums where it was suggested I
try the "synclient" command to manually turn off the touchpad:
https://forums.opensuse.org/showthread.php/512298-Disable-Dell-touchpad-on-external-mouse-plug-in

Reproducible: Always

Steps to Reproduce:
1. Run synclient TouchpadOff=1

Actual Results:  
Touchpad still works.

Expected Results:  
Touchpad should turn off.