Maximized window uses the wrong screen size

Binary package hint: xorg

Well, I only think that this has to do with Xinerama.

I dock my Dell E6410 laptop. Docking station has a DVI monitor connected. Ubuntu Lucid puts the DVI monitor on the right, while it is physically on the right. So I move it to the left and a bit up as the lower border of the screens are on the same level.

Now when I maximize window, it takes 3/4 of the monitor's screen or spans through two screens. See attached photo.

Somehow the windows think that the smaller laptop screen is on the left and the larger one is on the right, while this is the opposite.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic-pae 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic-pae i686
Architecture: i386
Date: Wed Jan 19 13:39:32 2011
InstallationMedia: Kaszanka 10.04.1 "Lucid Lynx" - Release i386 (20100903)
MachineType: Dell Inc. Latitude E6410
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-27-generic-pae root=/dev/mapper/system-root ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 08/10/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0667CC
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/10/2010:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn0667CC:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-27-generic-pae

[lspci]
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02)
     Subsystem: Dell Device [1028:040a]