So I applied this "big hammer" solution of the patch to the Trusty
(14.04) Xenial HWE kernel (4.4.0-47.68~14.04.1) and this fixes the bug.
I'll give it some more testing, while bisecting v4.0 to v4.1.

** Bug watch added: freedesktop.org Bugzilla #98832
   https://bugs.freedesktop.org/show_bug.cgi?id=98832

** Also affects: xorg-server via
   https://bugs.freedesktop.org/show_bug.cgi?id=98832
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1643843

Title:
  Distorted colours after suspend / resume cycle

Status in X.Org X server:
  Unknown
Status in xorg package in Ubuntu:
  New

Bug description:
  When waking up the system from a suspend-resume cycle, the display most times 
shows distorted colours.
  As a workaround one can switch to the linux console (VT) and back to fix the 
display.
  Alternatively triggering DPMS also fixes the problem (xset dpms force off ; 
sleep 0.1; xset dpms force on)

  Hardware:
   01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
   Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
   PCIID: 1002:6779

  I've tested Ubuntu Xenial (16.04) with the latest updates:

  mesa 11.2.0-1ubuntu2.2
  xserver-xorg-video-radeon 1:7.7.0-1
  linux-image-4.4.0-47-generic 4.4.0-47.68
  xserver-xorg-core 2:1.18.3-1ubuntu2.3

  I've tried older kernels, xorg, linux-firmware, as a colleague claimed
  it started for him after some of the latest Ubuntu updates, but
  couldn't find a working configuration.

  I also checked Ubuntu Yakkety (16.10), where I couldn't reproduce with
  XFCE, but instantly with the Unity session, but probably XFCE was just
  lucky, as sometimes I also had series of working (~5) cycles. Current
  versions:

  mesa 12.0.3-1ubuntu2
  xserver-xorg-video-radeon 1:7.7.1-1
  linux-image-4.8.0-27-generic 4.8.0-27.29
  xserver-xorg-core 2:1.18.4-1ubuntu6.1

  I'm also going to test Trusty (14.04) to check if it's really a
  regression. At least I have never seen this problem while running it.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: xorg 1:7.7+13ubuntu4
  ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
  Uname: Linux 4.8.0-27-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Nov 22 12:21:24 2016
  DistUpgraded: Fresh install
  DistroCodename: yakkety
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 
230 OEM] [1002:6779] (prog-if 00 [VGA controller])
     Subsystem: Bitland(ShenZhen) Information Technology Co., Ltd. Radeon HD 
6450 [1642:3a75]
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 4524BL8
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-27-generic 
root=UUID=4dda3a4b-6e9c-49ba-a969-5d2146f02b60 ro splash quiet vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/16/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9HKT54AUS
  dmi.board.vendor: LENOVO
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnLENOVO:bvr9HKT54AUS:bd10/16/2012:svnLENOVO:pn4524BL8:pvrThinkCentreM91p:rvnLENOVO:rn:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: 4524BL8
  dmi.product.version: ThinkCentre M91p
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.13.0+16.10.20160818.2-0ubuntu2
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160706-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2
  xserver.bootTime: Tue Nov 22 11:56:40 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-1ubuntu6.1
  xserver.video_driver: radeon

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