Private bug reported:

When I have my laptop unplugged for a while, such as during UDS, and
then plug in my laptop, the screen will dim. Unplugging the laptop
causes the screen brightness to return to normal.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,move,compiztoolbox,place,imgpng,mousepoll,grid,regex,resize,unitymtgrabhandles,snap,gnomecompat,animation,vpswitch,expo,workarounds,ezoom,session,wall,fade,scale,unityshell]
CompositorRunning: compiz
Date: Sat Nov 12 18:13:54 2011
DistUpgraded: Log time: 2011-09-23 20:01:46.149321
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller 
[8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:02be]
   Subsystem: Dell Device [1028:02be]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110715)
MachineType: Dell Inc. Studio 1555
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic 
root=UUID=07882bef-1a91-4139-b77c-540bacae5682 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (29 days ago)
dmi.bios.date: 03/29/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0D176M
dmi.board.vendor: Dell Inc.
dmi.board.version: A11
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A11
dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd03/29/2010:svnDellInc.:pnStudio1555:pvrA11:rvnDellInc.:rn0D176M:rvrA11:cvnDellInc.:ct8:cvrA11:
dmi.product.name: Studio 1555
dmi.product.version: A11
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs 20090808ubuntu26
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

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


** Tags: amd64 apport-bug compiz-0.9 oneiric running-unity ubuntu

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https://bugs.launchpad.net/bugs/889651

Title:
  Screen dims when plugging in laptop

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