It’s the synaptics touchpad driver. This one worked for me.
… and, I have not posted to this blog in well over a year. Wow. I’ve just been chugging along doing the needful. Or, tbh, I’ve been doing a lot of compliance and security and a lot less obscure errors and break fix. But this driver was pretty obscure and for an old laptop I have had the pleasure of owning for the last 5 or 6 years. Honestly, it is a really good laptop. It has long since stopped being my daily driver but made an excellent backup and great road trip device. Flips around and it’s small enough to fit on a car center console to provide entertaining videos to small children on road trips.