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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Ok I looked at backporting these three commits.  To cut a long story
short one of these is not needed because it is only applicable at the
higher level (though needed there) and one is actually for dpms issues.
This leaves the commit below:

  commit 63621dafc8e140afdfa12c8deadb41af818e455d
  Author: Ben Skeggs <bskeggs@xxxxxxxxxx>
  Date:   Wed Oct 1 11:11:25 2014 +1000

    drm/nouveau: punt fbcon resume out to a workqueue

plus a foundation commit:

  commit b6437dc0bfc8018c4c3a9e36cffdd073a4c1cf70
  Author: Ben Skeggs <bskeggs@xxxxxxxxxx>
  Date:   Sat Jun 28 20:44:07 2014 +1000

    drm/nouveau/kms: take more care when pulling down accelerated fbcon

I produced test kernels for these which @Nik.Th validated.  I will
submit these to kernel-team@ for review.

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https://bugs.launchpad.net/bugs/1386695

Title:
  [3.16.0-23] Resume from suspend/hibernation, GPU lock - possible
  regression

Status in The Linux Kernel:
  Confirmed
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  I'm testing the new development branch (Vivid Vervet), which currently has the Utopic kernel 3.16.0-23-generic installed. 
  (proposed repositories are enabled)

  This problem might be a regression, and it has been reported

  upstream:

  https://bugs.freedesktop.org/show_bug.cgi?id=81136

  Problem:

  When I try to resume from hibernation the screen hangs and the GPU is
  locked. It cannot load the graphics properly. The monitor loses its
  signal completely.

  Testing:

  Blacklisting the nouveau driver and perform the following
  hibernate/resume test, seems to indicate that indeed the problem is
  nouveau, because the test has been completed successfully:

  # echo platform > /sys/power/disk
  # echo devices > /sys/power/pm_test
  # echo disk > /sys/power/state

  Mainline:

  The problem seems to be fixed in latest stable mainline kernel, for now
  3.17.1-031701-generic (Utopic).

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.16.0-23-generic 3.16.0-23.31 [modified: boot/vmlinuz-3.16.0-23-generic]
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  nikos      1690 F.... pulseaudio
   /dev/snd/controlC1:  nikos      1690 F.... pulseaudio
   /dev/snd/controlC2:  nikos      1690 F.... pulseaudio
   /dev/snd/controlC0:  nikos      1690 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Oct 28 15:24:09 2014
  HibernationDevice: RESUME=UUID=f0688f3d-9938-4cb3-b79e-7c67f7593350
  InstallationDate: Installed on 2014-10-24 (4 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: MSI MS-7623
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic root=UUID=170bb898-7aa9-4678-8e80-58a445647f93 ro resume=/dev/disk/by-uuid/f0688f3d-9938-4cb3-b79e-7c67f7593350
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.138
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V17.9
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 880GMA-E45 (MS-7623)
  dmi.board.vendor: MSI
  dmi.board.version: 3.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 3.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV17.9:bd12/06/2010:svnMSI:pnMS-7623:pvr3.0:rvnMSI:rn880GMA-E45(MS-7623):rvr3.0:cvnMSI:ct3:cvr3.0:
  dmi.product.name: MS-7623
  dmi.product.version: 3.0
  dmi.sys.vendor: MSI

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