Right, disabled the trackpad entirely and I can at least type again.
Thankfully, it’s a tablet (although you can’t use it for programming – at least in Terminal, e.g., with Helix – in tablet mode because the on-screen keyboard in GNOME does not have all the keys you need. e.g., ESC is missing. Kind of a biggie when using a modal editor) so I can use the touch-screen if I need to (not ideal ergonomically when using it docked but goodness it feels good to be able to type again.