"Dell XPS 15 computers were released over a year ago and the lineup has been recently updated with Kaby Lake processors, but unfortunately owners are still waiting for Dell to fix some things, like Intel's Speed Shift. The technology is not supported and according to Dell's representative, there are no plans on supporting the tech. Both the XPS 9550 and 9560 models won't get new BIOS update that would support the Speed Shift."   Link
 
 
 
Well that's not good for those who have them. Not good Dell.