2015 13" mbp display brightness

Does anyone know how to get the display brightness working in KDE on a 2015 13" mbp?

I can change it by echoing values into /sys/class/backlight/intel_backlight/brightness as root but Ideally i’d like it to work with the buttons on the keyboard or at least be controllable from within KDE using the power controls.

installing xf86-video-intel may well have solved this.