According to http://ubuntuforums.org/showthread.php?t=2038250
xscreensaver's fading effect might be the cause of the darkened screen.

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https://bugs.launchpad.net/bugs/1015297

Title:
  Screen partially darkened after suspend and resume in Xubuntu

Status in pm-utils:
  Incomplete
Status in Xfce4 Power Manager:
  New
Status in Xubuntu:
  New
Status in “fglrx-installer” package in Ubuntu:
  Confirmed

Bug description:
  3 days ago after the most recent kernel update, my computer wouldn't
  start and got stuck on the screen reporting that it couldn't detect
  the hardware and start X. I reinstalled Ubuntu and the Xubuntu
  desktop, and somehow I am no longer getting that error, but now
  whenever I suspend and resume Xubuntu, the whole desktop is darkened
  as if there's a layer of semi-transparent black over everything. The
  mouse cursor is still completely white, so I know it's not a monitor
  brightness issue. If I suspend and resume again, it's twice as dark,
  as if there are now two semi-transparent black layers over the screen.
  When I restart or log out and back in again, it's back to normal until
  I suspend again. It doesn't happen every time I suspend--just most of
  the time.

  I have no idea what package this is actually a problem with. It may
  have something to do with XFCE. I tried killing and restarting
  metacity and that didn't help, and neither did killing the
  screensaver.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
  Uname: Linux 3.2.0-25-generic-pae i686
  NonfreeKernelModules: fglrx
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: i386
  CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,move,dbus,screenshot,gnomecompat,resize,mousepoll,place,imgpng,grid,session,regex,animation,wall,wobbly,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
  CompositorRunning: None
  Date: Tue Jun 19 22:06:33 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  DkmsStatus:
   fglrx-updates, 8.960, 3.2.0-20-generic-pae, i686: installed
   fglrx-updates, 8.960, 3.2.0-25-generic, i686: installed
   fglrx-updates, 8.960, 3.2.0-25-generic-pae, i686: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI RS880M [Mobility Radeon HD 4200 Series] 
[1002:9712] (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1b62]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
  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: ASUSTeK Computer INC. 1215T
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic-pae 
root=UUID=e8e8d0e7-09c3-4713-8ca3-476b0fa5e03b ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/27/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0303
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 1215T
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer INC.
  dmi.chassis.version: x.x
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0303:bd08/27/2010:svnASUSTeKComputerINC.:pn1215T:pvrx.x:rvnASUSTeKComputerINC.:rn1215T:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
  dmi.product.name: 1215T
  dmi.product.version: x.x
  dmi.sys.vendor: ASUSTeK Computer INC.
  version.compiz: compiz 1:0.9.7.8-0ubuntu1
  version.fglrx-installer: fglrx-installer N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
  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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