I have installed the intel graphic driver and it has improved but still, after 
a while that I am doing some little bit "heavy" with the card, my computer just 
get slowly.
VLC got better after the new driver, maybe my graphic card isn't that powerful

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https://bugs.launchpad.net/bugs/1194678

Title:
  Xorg high cpu usage

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  Xorg use a lot of CPU, almost 90 or more % and I dont know why this is 
happening.
  Also when I start to copy files the system seems to block for a while and 
then I see xorg 90% 

  Please tell me what I have to do to fix this problem, I just installed
  the new version, before I was using 12.04 and I hadn't any of these
  issues.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-25.37-generic 3.8.13
  Uname: Linux 3.8.0-25-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu8.1
  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
  Date: Tue Jun 25 23:35:48 2013
  DistUpgraded: Fresh install
  DistroCodename: raring
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 6.20.155.1+bdcom, 3.8.0-19-generic, x86_64: installed
   bcmwl, 6.20.155.1+bdcom, 3.8.0-25-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:161d]
  InstallationDate: Installed on 2013-06-23 (2 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Hewlett-Packard HP ProBook 6460b
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-25-generic 
root=UUID=9fe42ece-cd8d-4ce0-883e-a1e749412bca ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgConf:
   Section "Device"
     Identifier "Card0"
     Driver "intel"
     Option "AccelMethod" "sna"
   EndSection
  dmi.bios.date: 08/26/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68SCE Ver. F.08
  dmi.board.name: 161D
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 97.45
  dmi.chassis.asset.tag: CNU15025ZY
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68SCEVer.F.08:bd08/26/2011:svnHewlett-Packard:pnHPProBook6460b:pvrA0001D02:rvnHewlett-Packard:rn161D:rvrKBCVersion97.45:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 6460b
  dmi.product.version: A0001D02
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.43-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.3-0ubuntu0.3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.3-0ubuntu0.3
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.7-0ubuntu1
  xserver.bootTime: Tue Jun 25 20:53:07 2013
  xserver.configfile: default
  xserver.errors:
   intel(0): Detected a hung GPU, disabling acceleration.
   intel(0): When reporting this, please include i915_error_state from debugfs 
and the full dmesg.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu6
  xserver.video_driver: intel

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