We suggest you to contact the manufacturer of your computer to receive the further drivers, because they have modified the devices where the video, audio, or other features are generated. These changes have been implemented in their drivers, which in this specific case can be found as a reference at the following web site:
Please let us know if this information is useful to you.
It's known issue - hopefully Asus or Intel will release a new driver to fix this.... In the meantime, there's no actual problem - just the annoying "!" In device manager
if you really can't stand it, you can downgrade your Intel driver from 18 to 17 which does get rid of the unknown device.... Of course, now you have an "out of date device".... Pick your poison I suppose....