I'm running Fedora 26 alpha von this quite nice laptop.
What I really don't understand is the function key functionalities.
When I login GNOME all the function keys work like sound adjustment and backlight brightness. When I login XFCE none works. When I login cinnamon only sound adjustment works.
What do I need to do in order to get backlight brightness adjustment keys working in Cinnamon?
I already figured out that in /sys/class/backlight/intel_backlight/ the settings are stored and can be manipulated in the file backlight.