To make these annoying warnings go away I used:

$ sudo cp assembly/hello  /lib/firmware/i915/kbl_dmc_ver1_01.bin
$ sudo cp assembly/hello /lib/firmware/i915/kbl_guc_ver9_14.bin
$ sudo cp assembly/hello /lib/firmware/i915/bxt_guc_ver8_7.bin
$ sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.9.5-040905-generic

Voila! Error (warning) messages went away. It's been working fine for
1/2 hour.

"hello" is a 504 byte assembly program that simply says "Hello World!"
when run. I presume you can copy any executable program you want. When
Intel eventually gets around releasing the "kaby lake" processor and
appropriate drivers they will overwrite my fake drivers.

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-firmware in Ubuntu.
https://bugs.launchpad.net/bugs/1611124

Title:
  W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin
  for module i915

Status in xen:
  Unknown
Status in linux-firmware package in Ubuntu:
  Invalid

Bug description:
  $sudo dpkg -i linux-image-4.8.0-040800rc1-lowlatency

  [...]

  update-initramfs: Generating /boot/initrd.img-4.8.0-040800rc1-lowlatency
  W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for 
module i915
  W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module 
i915

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-firmware 1.159
  Uname: Linux 4.8.0-040800rc1-lowlatency x86_64
  ApportVersion: 2.20.3-0ubuntu5
  Architecture: amd64
  Date: Mon Aug  8 17:50:38 2016
  Dependencies:
   
  InstallationDate: Installed on 2015-07-26 (379 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150723)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)

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