Public bug reported:

Problem:
Move a window around, or even simply move the mouse around while top is running 
and watch CPU usage instantly rise to 100%.

Extra Information:
It may or may not be relevant but my graphics card is a Radeon HD 7950 and it 
is using the latest open source drivers.

mmstick@mmstick-PC:~$ glxinfo | grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD TAHITI
OpenGL version string: 2.1 Mesa 10.0.0-devel (git-ab2da98 saucy-oibaf-ppa)
OpenGL shading language version string: 1.30
OpenGL extensions:

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu6
Uname: Linux 3.12.0-031200rc5-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.6-0ubuntu1
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Nov 11 19:07:26 2013
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Tahiti PRO [Radeon HD 7950] [1002:679a] 
(prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Device [1458:254c]
MachineType: To be filled by O.E.M. To be filled by O.E.M.
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.12.0-031200rc5-generic 
root=UUID=33eaa480-577f-4c3c-9d01-50cb4b95c533 ro splash quiet radeon.dpm=1 
radeon.audio=1
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/16/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1604
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH 990FX
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1604:bd10/16/2012:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnSABERTOOTH990FX:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.47+git1311111623.da738d~gd~s
version.libgl1-mesa-dri: libgl1-mesa-dri 10.0~git1311111625.ab2da9~gd~s
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.0~git1311111625.ab2da9~gd~s
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.2.0+git1311050907.e4cd0f~gd~s
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.905+git1311111624.c48993~gd~s
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10+git1311070905.480f09~gd~s
xserver.bootTime: Mon Nov 11 18:50:19 2013
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.14.3-3ubuntu4
xserver.video_driver: radeon

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


** Tags: amd64 apport-bug compiz-0.9 third-party-packages trusty ubuntu

** Summary changed:

- Abnormally High CPU Usage
+ Abnormally High CPU Usage (Ubuntu 14.04)

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1250277

Title:
  Abnormally High CPU Usage (Ubuntu 14.04)

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