Dual monitor setup with Nvidia graphics card: lightdm initial screen garbled for 10 seconds after login and before entering Unity desktop

[Walter Garcia-Fontes]

Right after entering the password and before entering into the Unity desktop, the screen becomes garbled by what it seems a random collage of the previous graphics session. It lasts for about 10 seconds and then it enters into the desktop normally and I do not see any other symptoms,

Steps to reproduce:

1. Boot up
2. Enter password in appropriate use in lightdm initial screen

What should happen? Enter into the desktop
What really happens? The screeen becomes corrupted by a collage of graphic pieces for about 10 seconds.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nvidia-current 295.20-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.20 Mon Feb 6 21:07:30 PST 2012
 GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu2)
.tmp.unity.support.test.0:

ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
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: Mon Mar 12 08:24:43 2012
DistUpgraded: Log time: 2012-03-05 08:32:48.198415
DistroCodename: precise
DistroVariant: ubuntu
GraphicsCard:
 NVIDIA Corporation G84 [Quadro FX 1700] [10de:040f] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:049a]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
MachineType: Dell Inc. Precision WorkStation T3400
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=dadc68cb-c217-4aef-a751-ba0b61137c4a ro quiet splash vt.handoff=7
SourcePackage: nvidia-graphics-drivers
UpgradeStatus: Upgraded to precise on 2012-03-05 (6 days ago)
dmi.bios.date: 06/04/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0TP412
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd06/04/2009:svnDellInc.:pnPrecisionWorkStationT3400:pvr:rvnDellInc.:rn0TP412:rvr:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T3400
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu5
version.ia32-libs: ia32-libs 20090808ubuntu33
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 8.0.1-0ubuntu2
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
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