FN keys are working weird on Asus FX553VD

[Vladislav Dalechin]

Hi all.
My FN keys on Asus FX553VD-E4082 are not working as it should.

The only FN buttons that are being recognized are:
  - FN + F1 (mute vol)
  - FN + F2 (raise down vol)
  - FN + F3 (raise up vol)

AND a very interesting thing I've noticed in Linux Mint ONLY:
FN+F9 launches Display and mint applications bar.

Something really weird is going on with ACPI problems and I don't know how to fix them.
Any help is appreciated. Thanks.

[Cristian Aravena Romero (caravena)]

See Bug #1796550.
--
Cristian Aravena Romero (caravena)

[Vladislav Dalechin (vladik2738)]

Thanks for an answer.
I am actually user of Linux Mint 19 and not Cosmic user. I've installed package referenced in that topic, but I don't understand how to use it.