I have a Dell XPS 8700 - 4th gen i7 running Windows 8.1 with Intel 4600 graphics
Ever since 8.1, my dual monitor support is gone.
In the device manager, on the Intel display adapter, I get "Windows has stopped this device because it has reported problems. (Code 43)"
I can revert to previous driver (an old one) and it will work, but crash on things randomly (full screen videos, etc)