I recently installed the awesome community edition of manjaro (18.0) and found that the polkit isn't functioning. I am not sure if it just me, but I found that mate-polkit was installed and not running???
For those who want to have polkit I suggest removing mate-polkit and installing polkit-gnome and adding the following line to your .xinitrc
# awesome is kept as default DEFAULT_SESSION=awesome # PolKit /usr/lib/polkit-gnome/polkit-gnome-authentication-agent-1 &
Of course, if you know of a better way of implementing polkit let me and others know!