This message was posted on behalf of Intel Corporation
Thank you for contacting us regarding the support of WDDM (2.1, 2.2) on your Intel® Core™ i7-5775C Processor; it will be more than a pleasure to assist you
Currently, we offer WDDM 2.2 support for Kaby Lake graphics controllers only (or newer platforms). Other platforms such as Skylake CPUs support up to WDDM 2.1. There is no information about if in the future there will be or not WDDM2.1 or 2.2 drivers for Broadwell CPU’s such has your Intel® Core™ i7-5775C.
I hope this helps,