How to get rid of sticky Fn key in Linux?

Question

linux

Volume control combinations stick: Fn + F6 / F7 / F8 . It looks like it's pressed and won't let go. So it hangs until you press a working combination with Fn. All other function keys (brightness, on / off touchpad, Wi-Fi) worked fine from the very first day in all distributions out of the box, there were never any problems. Notebook Samsung NP355V4C.
The problem has been around for 5 years, the last couple of years on a Fedora laptop. Previously assigned other key combinations, but tired. It’s already 2017 in the yard, Wayland out of the box, the video works fine, energy saving is more or less, which is not there - but such a trifle has not been decided.
On Windows everything works as it should.
Googling did not help, there is a stupor everywhere, for example:
forum.oszone.net/thread-281759-4.html

Answer 1

Figured it out thanks to the archeologists:
archlinux.org.ru/forum/topic/16986

Answer 2

assign some wild combinations
to .xinitrc check xev