Comment 2 for bug 1611124

This warning means that the driver references the firmware but that it isn't installed. Intel has not yet pushed out this firmware to upstream linux-firmware, once they have done so it will make it's way into Ubuntu. I'll also point out that we don't officially support any 4.8-based kernels yet, and when running early -rc kernels you're likely to hit some snags.

Marking as invalid on the basis of using a non-supported kernel and because the firmware is not upstream.