Alt-Tab application switcher is offset by one when on external monitor. In the attached screenshot you can see that even though Software Center is centered, the skewed icon on the left for Xchat is the one which is actually selected. I can't reproduce this when running it on the integrated LCD.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.12.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic i686
NonfreeKernelModules: wl
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Sat Sep 3 15:24:08 2011
DistUpgraded: Log time: 2011-08-27 12:50:23.535811
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
bcmwl, 5.100.82.38+bdcom, 3.0.0-8-generic, i686: installed
bcmwl, 5.100.82.38+bdcom, 3.0.0-9-generic, i686: installed
GraphicsCard:
Intel Corporation Mobile 945GME Express Integrated Graphics Controller [8086:27ae] (rev 03) (prog-if 00 [VGA controller])
Subsystem: Dell Device [1028:02b0]
Subsystem: Dell Device [1028:02b0]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110817)
MachineType: Dell Inc. Inspiron 910
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic root=UUID=26fea171-547a-442d-9d22-2990f283c12c ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-08-27 (7 days ago)
dmi.bios.date: 09/15/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: CN086A
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A01
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd09/15/2008:svnDellInc.:pnInspiron910:pvrA01:rvnDellInc.:rnCN086A:rvrA01:cvnDellInc.:ct8:cvrA01:
dmi.product.name: Inspiron 910
dmi.product.version: A01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu1
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+7ubuntu6
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
Thanks for the bug report. It seems these screen resolution are not really what Unity targets and I see no chance for that changing. I believe I even read John Lea saying 1024*576 is whats our minimal supported resolutions