(In reply to Andrej Lazo from comment #14) > I've tested fn keys while install - and when kernel was loading they reacted. > > Now I'am able to change LCD brightness via battery monitor but not using fn > keys. It might be that some wrong keymap is applied for your device. You can try to remove /usr/lib/udev/hwdb.d/60-keyboard.hwdb and reboot. (Better to make a backup that file to restore later, of course.)