Unity does not work in dual-head setup

[Michael Wild]

Binary package hint: unity

I tried to use my external monitor with the Unity desktop in a fresh natty-upgrade on my Lenovo ThinkPad T410 (nVidia GT218 NVS 3100M, using the proprietary driver) and things are completely broken:

* If I set the external monitor to be either left or right of the internal screen and use a vertical screen resolution that is larger than that of the internal monitor (1920x1080 vs. 1440x900), the launcher and the menu-bar are placed at a vertical offset as displayed in the attached screenshot. Strangely, the mouse-interaction with the launcher seems to be "correct" (i.e. without the offset) such that it is impossible to hit any of the buttons. If both screens have the same vertical resolution, things are fine. The menu-bar, however, does not react to the mouse in any way.

* If I set the external monitor to be "above" (irrespective of the resolution), the launcher appears on the internal, lower, monitor if I move the mouse to the top-left corner of the *external, upper* monitor.

* If the external monitor is set to be "below" (again, independent of the resolution), neither the launcher or the menubar apper on the screen.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.6.2-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-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 270.29 Wed Feb 23 16:18:35 PST 2011
 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-5ubuntu1)
Architecture: amd64
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
Date: Tue Mar 8 14:34:09 2011
DistUpgraded: Log time: 2011-03-08 11:01:26.161353
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 nVidia Corporation GT218 [NVS 3100M] [10de:0a6c] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Lenovo ThinkPad T410 [17aa:2142]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InstallationMedia_: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
InstallationMedia__: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
MachineType: LENOVO 2522EM2
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-5-generic root=UUID=57d6af22-b7f8-48fe-b6ad-f2046926a3e7 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
ProcVersionSignature__: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-03-08 (0 days ago)
dmi.bios.date: 08/27/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6IET72WW (1.32 )
dmi.board.name: 2522EM2
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6IET72WW(1.32):bd08/27/2010:svnLENOVO:pn2522EM2:pvrThinkPadT410:rvnLENOVO:rn2522EM2:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2522EM2
dmi.product.version: ThinkPad T410
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.4-0ubuntu4
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu5