Technically they are testing kernels, but not bleeding edge. Bleeders would use 4.11-rc2. Testing kernels are in-line to become stable kernels.
I totally agree about the free driver use. There are just no cases where you have to worry about the kernel driver really messing up. That said, I just plugged in my old MSI GSI GS70 to happily discover that the nouveau/intel drivers now OOTB allow DP both mini-DP connectors to work at the same time, so that Kepler/MUX/Intel work has really paid off.
Are you using an ubuntu kernel or a vanilla kernel? The nice thing about getting away from Ubuntu is being able to run non-ubuntu patched kernels with less concern.