Have new Skylake desktop, with persnickity Radeon RX 460 video card, with Ubuntu 16.04.
It is running drivers from both AMD and Intel's websites, and I'm using both the IGP and RX 460 to drive monitors. Works fine. I hotplug monitors with it, and they just work with the default Unity.
It was an unrepentant pain in the dick to actually download those drivers (since neither website is navigable using links or lynx): It is literally impossible to install AMD's drivers for this card on a new installation of Ubuntu without outside assistance. (I wound up using a thumb drive and another computer.)
But once the drivers were installed, I've had no problems. (OK, some problems: I get some video tearing on pornhub.com, but I don't find it distracting in that context. Youtube and other video sites work fine. Haven't done anything with local media and a real media player, but I expect it to be fine.)
Monitors sleep fine, everything runs cool and damn-near silent with no effort on my part -- power consumption must be low. Zero hangs, but it's only been a week of solid use. Who knows.
Anyhow, by all accounts I should have a ridiculously unstable, hard-to-configure system, and while the latter is true the former is not: Again, it's fine. I'm impressed by how well it works.
A laptop with Skylake's IGP should be exactly the same except perhaps for suspend/resume: After all, the functional difference (as software is concerned) between a laptop and a desktop, both with Skylake and IGP, is almost nil. This stuff is rather completely homogenized.