I then tried the non-OEM adapter on one of my D630s and everything seems find there.
So, then I pulled out my trusty old (and I do mean old) voltmeter / multitester. I turns out the non-OEM adapter is putting out closer to 20 volts while the real Dell adapters are putting out closer to 19.5 volts.
So, the touchpad is sensitive to over-voltage?
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