Public bug reported:

If I turn off the LCD display in my Dell Inspiron 910 and turn on the
external display set to 1024x768, I see an 800x600 display in the top
right of a 1024x768 display (see attached screenshot). I can move the
mouse outside the 800x600 area, but no windows show up.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu6
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
NonfreeKernelModules: wl
Architecture: i386
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Sat Sep  3 15:04:19 2011
DistUpgraded: Log time: 2011-08-27 12:50:23.535811
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 5.100.82.38+bdcom, 3.0.0-8-generic, i686: installed
 bcmwl, 5.100.82.38+bdcom, 3.0.0-9-generic, i686: installed
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Mobile 945GME Express Integrated Graphics Controller 
[8086:27ae] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:02b0]
   Subsystem: Dell Device [1028:02b0]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110817)
MachineType: Dell Inc. Inspiron 910
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic 
root=UUID=26fea171-547a-442d-9d22-2990f283c12c ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (7 days ago)
dmi.bios.date: 09/15/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: CN086A
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A01
dmi.modalias: 
dmi:bvnDellInc.:bvrA01:bd09/15/2008:svnDellInc.:pnInspiron910:pvrA01:rvnDellInc.:rnCN086A:rvrA01:cvnDellInc.:ct8:cvrA01:
dmi.product.name: Inspiron 910
dmi.product.version: A01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu1
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+7ubuntu6
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
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

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


** Tags: apport-bug compiz-0.9 i386 oneiric reproducible running-unity ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/840564

Title:
  Displaying 1024x768 on external monitor shows 800x600 with black
  border

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/840564/+subscriptions

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