Desktop results distored when attaching second screen

[Luca Carlon]

Binary package hint: unity

Whenever a second screen (tried with two different screens, 1920x1080 and 1280x1024) is attached, the display is completely distorted. I attached one example.

What happens is that the screen is immediately distorted, a part of the screen seems to be correct, other parts completely distorted. Some areas are only black and white like in the image.
I noticed that in some areas the mouse cursor appears, in others it doesn't. If I try to move a window around, in some areas it is drawn, in others it is not.
I also noticed something interesting: in some cases, in some areas, the distorted image is from something that shouldn't be on the screen, but that was on the screen some minutes ago, like the screen was somehow showing, with distortion, areas of memory containing old garbage.

This happens whenever I try to attach something in Unity. Doesn't happen with Gnome on the same system.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.12-0ubuntu1
Uname: Linux 2.6.39-020639rc7-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.DIN.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.HDMI.A.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
 edid-base64: AP///////wAyDCABAAAAAAASAQOAIRV4ChRlmFlTiygjUFQAAAABAQEBAQEBAQEBAQEBAQEBEhsAiFAgEDAwGDYAS88QAAAZAAAAAAAAAAAAAAAAAAAAAAAAAAAA/gBMR1BoaWxpcHNMQ0QKAAAA/ABMUDE1NFdYNC1UTEM4AEg=
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: Off
 modes: 1280x1024 1280x1024 1024x768 1024x768 1024x768 800x600 800x600 800x600 640x480 640x480 640x480 720x400
 edid-base64: AP///////wAiZJqJyBYAABgQAQNsJh54Kv1WpVNKnSQUT1StzwCBgAEBAQEBAQEBAQEBAQEBMCoAmFEAKkAwcBMAeC0RAAAeAAAA/QA4Sx5QDgAKICAgICAgAAAA/ABIVTE5NkQKICAgICAgAAAA/wA2MjRHQTNGQ0E1ODMyADY=
Date: Sun May 22 23:21:44 2011
DistUpgraded: Log time: 2011-04-30 01:41:39.098164
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc Mobility Radeon HD 3400 Series [1002:95c4] (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:ff1e]
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
InstallationMedia_: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
InstallationMedia__: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
MachineType: TOSHIBA Satellite Pro A300
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US:en
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.39-020639rc7-generic root=UUID=4635bd6c-8c24-4f5f-b2f6-02c1bd5d5ec8 ro quiet splash vt.handoff=7
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-04-30 (22 days ago)
dmi.bios.date: 12/07/2009
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.20
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvr2.20:bd12/07/2009:svnTOSHIBA:pnSatelliteProA300:pvrPSAGDE-02C002IT:rvnTOSHIBA:rnPortablePC:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Satellite Pro A300
dmi.product.version: PSAGDE-02C002IT
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7