Public bug reported:

Pressing alt-tab to switch to the last window sometimes leaves no window 
focused.
It may be because I have a slow computer (Celeron at 1.7Ghz) but about 30% of 
the time when I switch window I end up with no window focused.

I believe it happens if alt is released just before the tab switcher is
appearing.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.6.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
Uname: Linux 3.5.0-15-generic i686
.tmp.unity.support.test.0:
 
ApportVersion: 2.6.1-0ubuntu1
Architecture: i386
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Wed Oct  3 18:59:51 2012
DistUpgraded: Fresh install
DistroCodename: quantal
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0106] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: COMPAL Electronics Inc Device [14c0:005a]
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta i386 (20120926)
Lsusb:
 Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 064e:f245 Suyin Corp.
MachineType: Compal PBL10
ProcEnviron:
 LANGUAGE=es_PE:es
 TERM=xterm
 PATH=(custom, no user)
 LANG=es_PE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-15-generic 
root=UUID=ba31d793-e203-4862-87a9-0981eb9f79b5 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/20/2012
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.80
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: PBL10
dmi.board.vendor: Compal
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Compal
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnINSYDE:bvr2.80:bd04/20/2012:svnCompal:pnPBL10:pvr2.80:rvnCompal:rnPBL10:rvrBaseBoardVersion:cvnCompal:ct10:cvrChassisVersion:
dmi.product.name: PBL10
dmi.product.version: 2.80
dmi.sys.vendor: Compal
version.compiz: compiz 1:0.9.8.4-0ubuntu1
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20120917.7cfd42ce-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20120917.7cfd42ce-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu5
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu2

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 i386 quantal running-unity ubuntu

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https://bugs.launchpad.net/bugs/1061321

Title:
  Switching windows with alt-tab leaves no window focused

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