Intel drm/i915 driver in Linux kernel 4.6.0 has a fatal bug on running Xorg server (See https://lists.freedesktop.org/archives/intel-gfx/2016-May/095987.html ), must be patched to revert the broken commit of "drm/i915: Exit cherryview_irq_handler() after one pass" 9dbaab56ac09f07a73fe83bf69bec3e31060080a ( https://patchwork.freedesktop.org/patch/76453/ ).
Thank you for the report and the link.