Compiz Grid plugin places the window in the wrong display

[Huji Lee]

After upgrading to 14.04 LTS, compiz Grid plugin is not producing the expected behavior. I am using the defalut keyboard shortcts to place windows on the left/right of the current display. Placing on the left side works properly; however, when I have a window on my left-side Display, and I press <Control><Alt>KP6 to put it on the right side of the display, one of these three events happen at random:

* Sometimes it works correctly and places the window on the right half of the screen.
* More often, it puts the window on the right-half of the *other display*.
* Sometimes it puts the window on the right side of the same dispaly, but with a one-inch margin on the right side (so not touching the edge of the display).

This problem didn't exist with 12.04 LTS or 13.10 on the same machine with the same config.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: compiz 1:0.9.11+14.04.20140409-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,resize,compiztoolbox,put,move,vpswitch,imgpng,regex,snap,mousepoll,gnomecompat,grid,place,session,animation,workarounds,expo,wall,fade,ezoom,scale,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon May 5 09:43:06 2014
DistUpgraded: 2014-04-28 16:01:31,465 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.7, 3.11.0-20-generic, x86_64: installed
 bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
 virtualbox, 4.3.10, 3.11.0-20-generic, x86_64: installed
 virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] RV620 PRO [Radeon HD 3470] [1002:95c0] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:3243]
InstallationDate: Installed on 2012-04-28 (737 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Dell Inc. OptiPlex 780
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: Upgraded to trusty on 2014-04-28 (6 days ago)
dmi.bios.date: 04/30/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0C27VV
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd04/30/2010:svnDellInc.:pnOptiPlex780:pvr:rvnDellInc.:rn0C27VV:rvrA01:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 780
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Tue Apr 29 11:08:56 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.15.1-0ubuntu2
xserver.video_driver: radeon