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[Bernhard <1283938@xxxxxxxxxxxxxxxxxx>]

Further tests of versions of kernels 3.11 and 3.13, and Xstacks saucy and trusty on 12.04 showed only black screens. 
=> Now saucy too !!

But I've found a workaround for my config/setup 
(12.04 with kernel and Xstack from trusty with nvidia driver, lightdm with kde, and only hibernate used);

Boot your system to lightdm, then login to your Desktop Environment , let it finish ...
After that logout back to lightdm screen and login again !
=> Now try to hibernate, after the resume there is no black screen anymore and you can unlock the screen and use your desktop!!

My résumé after testing is that maybe there is a race condition in the services/daemons (acpid, dbus, lightdm) or different bugs are playing together (Kernel, X, drivers, daemons). 
That's why I've downgraded lightdm's version in 12.04, but without success, only the workaround, described above, helps for me.

Please help to solve this nasty bug, because it is now in 12.04 too !

Maybe lightdm changes? Or system components like dbus? 
=> Browsing the lightdm versions in 12.04

lightdm (1.2.3-0ubuntu2.4) precise-proposed; urgency=low

  [ Robert Ancell ]
  * debian/patches/06_config_directory.patch:
    - Backport conf.d configuration support (LP: #1190425)

  [ Alberto Milone ]
  * debian/patches/07_add_display-stopped-script.patch:
    - Backport support for the display-stopped-script entry
      in the configuration file (LP: #1259237)
 -- Alberto Milone <email address hidden> Wed, 18 Dec 2013 14:31:49 +0100

lightdm (1.2.3-0ubuntu2.3) precise; urgency=low

  * debian/guest-account: disable screen locking in a more reliable way.
    Rather than trying to write a key for another user, while setting up the
    guest user account, just set up an autostart desktop that will set it
    during the login (lp: #951000)
 -- Sebastien Bacher <email address hidden> Mon, 08 Jul 2013 13:47:53 +0200

Thanks, Bernhard

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1283938

Title:
  [Samsung NP535U4X-S01TH] Ubuntu 14.04 blank screen after wakeup from
  sleep

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  In 14.04 after wakeup from suspend, the notebook screen goes blank
  while the OS and the hardware is awake (I can also press Ctrl+F1 and
  Ctrl+Alt+Del to reboot the system).

  Changeing "quiet splash" to "nomodeset" in /etc/default/grub allows
  the wakeup, but the pc is really slow (can't be used).

  WORKAROUND: This problem is not happening with the AMD property
  drivers.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-ati 1:7.3.0-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
  Uname: Linux 3.13.0-11-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.13.2-0ubuntu5
  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: Mon Feb 24 12:58:07 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.3.6, 3.13.0-11-generic, x86_64: installed
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7500G] [1002:990a] (prog-if 00 [VGA controller])
     Subsystem: Samsung Electronics Co Ltd Device [144d:c660]
   Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M] [1002:6841] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2014-02-22 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140218)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 535U4C
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-11-generic root=UUID=9f8c7e92-a6ea-41fd-9489-a256c8b9f5d5 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-ati
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/03/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P06RAF.N93.130403.LEO
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP535U4X-S01TH
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP06RAF.N93.130403.LEO:bd04/03/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn535U4C:pvrP06RAF:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP535U4X-S01TH:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 535U4C
  dmi.product.version: P06RAF
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  version.compiz: compiz 1:0.9.11+14.04.20140218-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc1-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc1-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Mon Feb 24 12:54:54 2014
  xserver.configfile: default
  xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.0-1ubuntu6
  xserver.video_driver: radeon

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