Thanks to suggestions from Stuart Longland (VK4MSL) (npub12n5…9dex) I learned a bit about *BSD and PC hardware by tracing my touchpad and keyboard problem in #NetBSD:
1. I found a forum thread about touchpad issues with a hint that #OpenBSD is known to have better touchpad support than NetBSD
2. the blog of Joshua Stein who works on notebook hardware compatibility in OpenBSD
To understand how hardware support works, the following is a great source!
https://jcs.org/2019/07/28/ihidev