Public bug reported:

Binary package hint: unity

ALT TAB takes almost a sec to show up and its buggy as hell with windows
not focusing or with a lot of tearing.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.4.6-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.DVI.D.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1920x1080 1680x1050 1280x1024 1440x900 1440x900 1280x960 1280x800 
1152x864 1280x720 1152x720 1024x768 1024x768 1024x768 832x624 800x600 800x600 
800x600 800x600 640x480 640x480 640x480 640x480 720x400
 edid-base64: 
AP///////wAJ0Vp4RVQAACUUAQOAMBt4LuYVplVJmScTUFS/74BxAHFPgcCBAIFAlQCVD7MAAjqAGHE4LUBYLEUA3g0RAAAeAAAA/wBIOUEwMDM3NTAyNgogAAAA/QAyTBhTFQAKICAgICAgAAAA/ABCZW5RRzIyMjJIREwKACg=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes: 
 edid-base64:
Date: Sat Feb 26 23:17:03 2011
DistUpgraded: Yes, recently upgraded Log time: 2011-02-26 20:23:28.176321
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc RS880 [Radeon HD 4200] [1002:9710] (prog-if 00 [VGA 
controller])
   Subsystem: Giga-byte Technology Device [1458:d000]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
InstallationMedia___: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
MachineType: Gigabyte Technology Co., Ltd. GA-MA785GM-US2H
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-5-generic 
root=UUID=22d80a93-4843-476a-9ffb-28e2555d5a8b ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
ProcVersionSignature__: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
ProcVersionSignature___: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Renderer: Unknown
SourcePackage: unity
dmi.bios.date: 03/22/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F9
dmi.board.name: GA-MA785GM-US2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF9:bd03/22/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA785GM-US2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA785GM-US2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA785GM-US2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.4-0ubuntu1
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu8
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu11
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110107+b795ca6e-0ubuntu5

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


** Tags: amd64 apport-bug compiz-0.9 natty running-unity ubuntu

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https://bugs.launchpad.net/bugs/725664

Title:
  ALT-TAB extremely slow with OSS ATI driver

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