Old laptops can often be a pain if they don’t have mainstream hardware.
I have a laptop with a touchpad made by Elan. I couldn’t even find a website for them, but the laptop’s support page has a Windows driver that works well.
I put Linux on there maybe 5 years ago, and there just is no driver for this touchpad on Linux, so it works in PS2 mouse modus and nothing else. No multitouch, no gestures, no way to change any slightly more advanced settings like sensitivity.