Public bug reported:

When running Unity with stacked monitors (laptop display on the bottom,
external monitor above), the window-picker sometimes clusters the
available-windows directly over the split between the two monitors.

I've observed this happen when I use the meta-W key to pick windows as
well, so this is presumably a Compiz bug?  Does Compiz provide the
picker that lets you pick between the windows in an application?

My description is a little bit vague, since I'm new to Unity and I'm not
quire sure where Compiz ends and Unity begins.  I have, however,
attached a screenshot showing the problem.  Hitting "print screen"
brought the "System Settings" window, so I'd like to direct your
attention away from that window, and toward the upside-down (and
unpickable) windows near the middle of the screenshot.

To reproduce:
1. Run Unity in a configuration with a large monitor on the top, and a smaller 
monitor on the bottom.
2. Open an application that uses multiple windows, such as Chrome or 
Thunderbird and open several windows.
3. Click on the application's icon in the dock.
4. Observe the windows floating in the least pickable place on the desktop 
(right between the two screens, and underneath the indicator applet).
5. Try to pick a window.  Windows may be unpickable.

I've been trying to figure out if I should call this one intermittent.
It doesn't happen all of the time but, I can't remember if it's
intermittent and starts happening after a few minutes of uptime, or if
it's changed with a recent update.  In any case, it's happening pretty
consistently now.

BTW, I'm really enjoying running this beta and being a peripheral part
of this process!

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.16.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,gnomecompat,snap,vpswitch,grid,place,imgpng,regex,resize,session,move,mousepoll,unitymtgrabhandles,wall,animation,fade,expo,workarounds,ezoom,scale,unityshell]
CompositorRunning: compiz
Date: Wed Sep 21 09:23:55 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.2, 3.0.0-10-generic, x86_64: installed
 virtualbox, 4.1.2, 3.0.0-11-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems Device [1179:0005]
MachineType: TOSHIBA PORTEGE R835
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic 
root=UUID=d046bba5-6bff-42e7-ae6e-afcab4507acb ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/06/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 3.00
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: 
dmi:bvnTOSHIBA:bvrVersion3.00:bd08/06/2011:svnTOSHIBA:pnPORTEGER835:pvrPT324U-008003:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: PORTEGE R835
dmi.product.version: PT324U-008003
dmi.sys.vendor: TOSHIBA
version.compiz: compiz 1:0.9.5.94+bzr2803-0ubuntu5
version.ia32-libs: ia32-libs N/A
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+7ubuntu7
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: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 oneiric running-unity ubuntu

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https://bugs.launchpad.net/bugs/855613

Title:
  Choosing windows with vertically-stacked monitors

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