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[Rostislav Stříbrný <1283938@xxxxxxxxxxxxxxxxxx>]

PS: (to my previous comment)

My grub params in /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="noquiet nosplash acpi_osi=Linux acpi_backlight=vendor acpi_sleep=s4_nohwsig loop.max_part=63 loop.max_loop=64"
GRUB_CMDLINE_LINUX=""

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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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