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[pst007x <turone@xxxxxxxxxxx>]

Same issue here but with 13.10 64bit, however the problem for me was the
Nouveau display driver.

I am using Nvidia, and moved to a proprietary Nvidia driver, rebooted
and suspend now works fine.

So I would suggest checking what driver you are using and changing to
the proprietary driver available for your system.

Check in: SYSTEM SETTINGS / SOFTWARE & UPDATES / ADDITIONAL DRIVERS

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https://bugs.launchpad.net/bugs/989674

Title:
  Ubuntu 12.04 i386 does not reboot back Unity from suspend

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  I have just yesterday upgraded to Ubuntu 12.04 from Ubuntu 11.10
  running on my Acer Aspire 7535G. Now it seems that whenever I close my
  laptop lid to go to suspend or hit the suspend action, after i turn it
  back on suspend does not load back Unity session. Everything else in
  the background works but the screen stays lit but black with no image
  and no lock screen displayed. One work around I have found for this in
  the meantime is to hit Ctrl + Alt + F7 to manually reload the GUI and
  that brings me straight to the lock screen as desired. However this is
  a very annoying bug especially for a laptop user who wishes to quickly
  place the laptop in sleep mode and recover the current session
  successfully.

  WORKAROUND:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/989674/comments/8

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  Uname: Linux 3.2.0-24-generic-pae i686
  NonfreeKernelModules: fglrx
  .tmp.unity.support.test.0:

  ApportVersion: 2.0.1-0ubuntu6
  Architecture: i386
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Fri Apr 27 13:19:17 2012
  DistUpgraded: 2012-04-27 00:17:23,180 DEBUG enabling apt cron job
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus:
   fglrx-updates, 8.960, 3.2.0-24-generic-pae, i686: installed
   virtualbox, 4.1.12, 3.0.0-17-generic-pae, i686: installed
   virtualbox, 4.1.12, 3.2.0-24-generic, i686: installed
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI RS780M/RS780MN [Mobility Radeon HD 3200 Graphics] [1002:9612] (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0237]
   Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4500/5100 Series] [1002:9553] (rev ff) (prog-if ff)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  JockeyStatus:
   xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
   xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Disabled, Not in use)
  MachineType: Acer Aspire 7535
  ProcEnviron:
   LANGUAGE=en_IE:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_IE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic-pae root=UUID=8b69dec6-15bf-4028-8fd5-5aae405ba69e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to precise on 2012-04-26 (0 days ago)
  dmi.bios.date: 09/18/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V2.04
  dmi.board.name: JM70PU
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV2.04:bd09/18/2009:svnAcer:pnAspire7535:pvr0100:rvnAcer:rnJM70PU:rvrRev:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Aspire 7535
  dmi.product.version: 0100
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.7.6-0ubuntu1
  version.fglrx-installer: fglrx-installer N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

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