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My poor little laptop, Midgard, is on its way to Lenovo's warranty repair depot.  I'm convinced that the touchpad has a mechanical fault.  Unfortunately it's one of those intermittent things:  sometimes it works; sometimes it's dead; sometimes it's spastic like ferret on crystal meth.  And it's one of those things where, after hours of failed troubleshooting, it will suddenly start to work for no apparent reason, making me question my sanity and my odds of getting a decent repair under warranty.

All in all it seems to me to be the sort of thing that might be caused by a loose wire or a bad plug.  But I wasn't brave enough to find out myself---that would have voided the warranty!