If it's the issue involving limiting it to C6 or lower, that actually got fixed two weeks back and is just now being pushed to stable kernels - I'm running 4.4.7 no problems on Skylake hardware (Lenovo Yoga 700 (11-inch) with an Intel Core m5 6Y54 cpu) with all C-States enabled and powertop telling me it's spending time in C10 even. (Before 4.4.7 got released and packaged on Arch (3rd party repo, not main yet), I was running 4.6rc1 and rc2 to get this working.)

https://bugzilla.kernel.org/show_bug.cgi?id=109081 - The bug report of the issue.