They work untouched (obviously), however I am not sure how to tweak them
because 1) maybe options have dependencies 2) it's not easy to guess what is
what :p

The current linux-libre packages much more than I need, and my goal is to
produce a .config that is tailored to my machine.
So I could start from the aux-file and disable options one by one, but that
sounds like shooting in the dark while being extremely tedious.

If I just look at the mouse/trackpad and sound related options, I can't see
anything obvious that'd be missing, but maybe it's sheer lack of knowledge on my
end.

-- 
Pierre Neidhardt
https://ambrevar.xyz/