OK, too bad. In that case please file a bug at https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel and attach the Xorg log and xrandr output as you did here, and dmesg when booting with the drm.debug=6 kernel command line parameter to get some more output. Let us know the bug number so we can track it.
Bug number is 30845 - https://bugs.freedesktop.org/show_bug.cgi?id=30845 Paweł