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[davidw <david.westreicher@xxxxxxxxx>]

After upgrading to 14.10 i had the same problem again and my last fix #20 didn't work.
i had to
sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*
sudo apt-get install --reinstall xserver-xorg-core libgl1-mesa-glx:i386 libgl1-mesa-dri:i386 libgl1-mesa-glx:amd64 libgl1-mesa-dri:amd64
sudo dpkg-reconfigure xserver-xorg
sudo reboot

before:
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits)

now it works again:
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD CAYMAN

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https://bugs.launchpad.net/bugs/1268146

Title:
  Very high cpu usage for compiz in 14.04 (mesa incorrectly using
  llvmpipe)

Status in “mesa” package in Ubuntu:
  Confirmed

Bug description:
  I just upgraded to 14.04, and I'm seeing 50%-500% cpu usage from
  compiz.

  Strangely, glxinfo reports this, which is totally incorrect - I'm
  running on Intel Sandy Bridge HD3000 graphics and VMware isn't even
  installed on this PC:

  OpenGL vendor string: VMware, Inc.
  OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits)
  OpenGL version string: 2.1 Mesa 10.0.1

  So I guess that compiz might be using lots of cpu because it's using
  llvmpipe as the renderer. So is this a mesa bug?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20131106.1-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-1.16-generic 3.13.0-rc7
  Uname: Linux 3.13.0-1-generic x86_64
  .tmp.unity.support.test.1:
   
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Jan 11 22:27:28 2014
  DistUpgraded: 2014-01-11 12:30:22,360 ERROR SystemError from cache.commit(): installArchives() failed
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:050e]
   NVIDIA Corporation GF108M [GeForce GT 540M] [10de:0df4] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2012-08-25 (504 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
  MachineType: Dell Inc. Dell System XPS L502X
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-1-generic root=UUID=67083065-b92e-4596-a218-817c1dfc8ae7 ro quiet splash intel_pstate=enable crashkernel=384M-:128M vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-01-11 (0 days ago)
  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0NJT03
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.50-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu1
  xserver.bootTime: Sat Jan 11 22:20:55 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               41063 
   vendor                                     DEL
  xserver.version: 2:1.14.5-1ubuntu2

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