Charles R. Dennett composed on 2016-11-20 08:46 (UTC-0500): ...
Do you have any optional repos installed?
I have no Skylake systems, but I do have multiple versions of Fedora on multiple multiboot systems with Intel video. KDE in F24 is fine on all that I can recall, but not so with F25 and Rawhide, which on at least one (older than yours, Eaglelake) machine exhibits symptoms similar to what you report. The difference I see is that F25 and Rawhide are now using server 1.19rc1, while F24 (running 4.8.7 currently booted on host big41) remains on 1.18.4.
Regardless whether a 1.19 server is present, you could try the driver integrated into the server, "modesetting", (most easily) by uninstalling xorg-x11-drv-intel.
The modesetting driver seems to be the future of X regardless of gfxchip: http://www.phoronix.com/scan.php?page=news_item&px=Ubuntu-Debian-Abandon...