Unity Dock causes tearing

[bwat47]

Binary package hint: unity

This is an odd bug that may be a bit hard to describe properly, but here goes.

In a web browser (firefox, chrome, opera I have tested) if the browser window is overlapping the unity dock area (i.e. maximised window or you drag window over dock causing to hide) when you scroll in the web browser there is noticeable vertical screen tearing on the left side where the dock would be. If you move the window so it is not overlapping the dock there is no tearing at all when you are scrolling.

I have an ati mobilty radeon hd2600 and am using the catalyst 11.4 drivers. I have also tested this using the catalyst 11.5 prelease drivers. I have tear-free desktop enabled, I get no tearing anywhere else.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.12-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,gnomecompat,imgpng,mousepoll,wall,regex,compiztoolbox,resize,unitymtgrabhandles,move,vpswitch,grid,snap,place,animation,session,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Wed May 4 23:24:30 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: fglrx, 8.841, 2.6.38-8-generic, x86_64: installed
GraphicsCard:
 ATI Technologies Inc M76 [Radeon Mobility HD 2600 Series] [1002:9581] (prog-if 00 [VGA controller])
   Subsystem: Gateway 2000 Device [107b:0562]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
JockeyStatus: xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use)
MachineType: Gateway M-6862
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=2e7d117c-d1ab-43ff-bb3d-d574a49a8734 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.42-generic 2.6.38.2
ProcVersionSignature__: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/28/2008
dmi.bios.vendor: Gateway
dmi.bios.version: 91.22
dmi.board.vendor: Gateway
dmi.board.version: Rev1.91.22
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 8
dmi.chassis.vendor: Gateway
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnGateway:bvr91.22:bd03/28/2008:svnGateway:pnM-6862:pvr91.22:rvnGateway:rn:rvrRev1.91.22:cvnGateway:ct8:cvrN/A:
dmi.product.name: M-6862
dmi.product.version: 91.22
dmi.sys.vendor: Gateway
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7