Public bug reported:

Ubuntu release: Ubuntu 12.04.1 LTS
Package: xscreensaver 5.15-2ubuntu1

When resuming from suspend (invoked by keyboard interrupt) screen
remains partially dimmed (like a dark cloth over the screen) and only
mouse cursor is displayed in correct colours. I'm using proprietary AMD
drivers (fglrx) on ATI Mobility Radeon HD 4200.

This happens almost every second resume. The level of how much the
screen is also not constant.

This error disappear when the XScreenSaver option "Fade to Black when
Blanking" is disabled. Also when the screen is partially dimmed, it is
possible to restore it with change of gamma correction value in
'amdcccle' Catalyst control centre.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xscreensaver 5.15-2ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
Uname: Linux 3.2.0-35-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.0.1-0ubuntu15.1
Architecture: amd64
Date: Tue Jan 15 22:30:56 2013
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 
(20120823.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xscreensaver
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xscreensaver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

** Attachment added: "XScreen saver log when the problem appears"
   https://bugs.launchpad.net/bugs/1100048/+attachment/3484287/+files/log.txt

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https://bugs.launchpad.net/bugs/1100048

Title:
  Screen partially dimmed after resume in Xubuntu

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