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[Launchpad Bug Tracker <973932@xxxxxxxxxxxxxxxxxx>]

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[Problem]
In a multihead config with one monitor above the other, if the lower monitor is disabled the windows on that screen aren't moved to the still-active display.

[Test Case]
0.  Attach laptop (LVDS1) to an external display (VGA1).
1.  In the GNOME display properties applet, set the LVDS1 beneath VGA1.
2.  Move to the lower left desktop (ctrl+alt+down)
3.  Open one gnome terminal window on each monitor.
4.  In the upper (VGA1) gnome terminal window type:
    xrandr --output LVDS1 --off
   (Alternatively, bring up the gnome display properties applet and shut the laptop display off there)
5.  With the LVDS turned off, count the number of gnome terminal windows visible on VGA1
6. Using either xrandr or gnome, re-enable LVDS1 to the above/below arrangement
7.  With the LVDS re-enabled, count the number of gnome terminals visible on VGA1 and LVDS1

Expected:  2, then 1/1
Actual:
   Gnome Classic (No Effects):  2, then 1/1
   Gnome Classic (With Effects): 2, then 1/1
   Unity2D: 2, then 1/1
   Unity:  1, then 1/1

Other findings...
A.  On Unity, with LVDS1 off the missing gnome terminal window is inaccessible.  It can be recovered in various ways, but it's fairly confusing.

B.  If step #2 is skipped and the test performed in the upper left
desktop, Unity will place the lower windows into the lower left desktop.

C.  On Unity, repeated testing of this seems to scramble the window
positions to some extent.  The same effect does not appear to occur with
metacity; windows generally get placed back where they'd been before.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic i686
ApportVersion: 2.0-0ubuntu4
Architecture: i386
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
Date: Thu Apr  5 05:27:33 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2011-11-22 (135 days ago)

** Affects: compiz
     Importance: Medium
         Status: Incomplete

** Affects: compiz (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: apport-bug i386 precise
-- 
Disabling 'below' display does not reposition windows properly
https://bugs.launchpad.net/bugs/973932
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