I got a renewed Thinkpad T470p in a good shape and installed GhostBSD on it. Everything seems to work nice, even Fn-Keys F1 and F2 for sound adjustment. Not working are the Fn-Keys F5 and F6 to adjust the brightness.
Before installing GhostBSD, I tried NomadBSD on the Thinkpad and here the Keys worked, but not Fn + F5. I had to use Alt + F5. Don't know why but it did the job.
Currently I use "Gammly" to adjust the brightnes and temperature, manually or automatically.
Does somebody have a tip to get the Fn-keys working?
Thanks