Only those three keys won't work. Volume, screen brightness keys are working like a charm. Anyone know what's the problem? I tried already manualy to adjust media shortcuts eventho I knew it's system adjusted, so I opened up System Settings > Keyboard > Shortcuts > Sound & Media but everthing is ok there...
I am using Ubuntu 14.04.3 LTS on my HP 250 G4 Notebook, standard keyboard with numeric keys.
xev
and check if there is a output for the keys