This is wiered.
I tried, with my PC booted on kernel: 4.3.0-040300rc2-generic, to launch this 
command in terminal:

sudo sh -c "sync && echo 1 > /sys/power/pm_trace && pm-suspend"

as it says here:
https://wiki.ubuntu.com/DebuggingKernelSuspend#A.22resume-trace.22_debugging_procedure_for_finding_buggy_drivers

My PC looks like suspending: it turnes off and the power LED  slowly
flashes when in the suspended state (at least it looks like suspended).
I wait a bit, 2-3 minutes, press the power, button, I see the HD LED
flashing, but my PC returns from suspension without entering the lock
screen, I find it resumed just as I left it as nothing happened, no blue
screen no freeze, nothing.

I am attaching the dmesg file obtained immediatly after resuming from
suspension. As I did this twice I have two dmesg files to attach, one
for each time I suspended.

** Attachment added: "dmesg-first-time"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1490143/+attachment/4476581/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1490143

Title:
  When resuming after suspension desktop is freezed

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I suspended my PC for like about 1,5 - 2 hours and when I resumed the desktop 
had a black background, you could see the launcher bat you were unable to do 
anything it was freezed.
  This is my hardware: https://gist.github.com/anonymous/3203c7c5a43a509c0f22.
  I am attaching the screen-shots of my desktop after resuming, also in 
terminal (CTRL+ALT+F1) it looked rather garbled.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  BootLog:

  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Sat Aug 29 13:57:20 2015
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 5.0.2, 4.1.0-3-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   NVIDIA Corporation G84GL [Quadro FX 370] [10de:040a] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: NVIDIA Corporation Device [10de:0491]
  InstallationDate: Installed on 2015-08-16 (12 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150816)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.1.0-3-generic 
root=UUID=4b5d483e-4c0c-4013-b27c-0684b9343728 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/13/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0803
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M2N
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0803:bd09/13/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.12.1+15.10.20150805-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu3
  xserver.bootTime: Sat Aug 29 11:08:42 2015
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(0): [COPY] failed to allocate class.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu3
  xserver.video_driver: nouveau

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