Reproduced on Mainline 4.7.4

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1609598

Title:
  iMac 7,1 Screen "Bleached"/Corrupted after Waking from Suspend

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I've had this issue on my iMac 7,1 A1224 ever since I've installed
  Ubuntu 16.04. When waking from suspend, the screen will be washed out.
  Rebooting the system fixes this issue. I am aware that this issue
  happens for this machine across other versions of Ubuntu and the Linux
  kernel (is that a thing? I'm pretty inept), but I have been unable to
  find a resolution.

  This issue has also been discussed on the Free Desktops site:
  https://bugs.freedesktop.org/show_bug.cgi?id=90843

  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-31-generic 4.4.0-31.50
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alex       1884 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Wed Aug  3 08:15:39 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=8c3c66ec-44dd-4529-b552-ea8363ccc781
  InstallationDate: Installed on 2016-07-30 (4 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Apple Inc. iMac7,1
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic.efi.signed 
root=UUID=31f3cd66-85f4-415f-bafb-9d68c2e6597e ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-31-generic N/A
   linux-backports-modules-4.4.0-31-generic  N/A
   linux-firmware                            1.157.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/05/08
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM71.88Z.007A.B03.0803051705
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4238CC8
  dmi.board.vendor: Apple Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F4238CC8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrIM71.88Z.007A.B03.0803051705:bd03/05/08:svnAppleInc.:pniMac7,1:pvr1.0:rvnAppleInc.:rnMac-F4238CC8:rvrPVT:cvnAppleInc.:ct13:cvrMac-F4238CC8:
  dmi.product.name: iMac7,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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