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[Marco Ferretti <marco.ferretti@xxxxxxxxx>]

Same here. 
Samsung N230 netbook, Intel ATOM; XUbuntu 14.04 LTS

Closing the lid, waiting for suspension. Once the lid is open the
computer wakes up but the screen in blank. Restarting lightdm is
possible although not feasible since you'd loose all the work that you
did not save (thus making suspension useless).

As stated in #43, #100 and #134 manually starting pm-suspend works.


The problem was not there with 13.10 release

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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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