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[Alexander Zubkov <green@xxxxxx>]

I have same behaviour on notebook with AMD A4-5000 APU with embedded [AMD/ATI] Kabini [Radeon HD 8330].
When I press "Log Out ..." button or make screenshot - Xorg starts eating 100% of one CPU core for long time.
Ctrl-Alt-F1, Ctrl-Alt-F7 pop ups logout selector window immediately. Changing driver to proprietary fglrx is helped too.
I have tried to install 4.2 kernel with "apt-get install linux-generic-lts-wily", but it does not helped.
$ uname -a
Linux hp17 4.2.0-23-generic #28~14.04.1-Ubuntu SMP Thu Dec 31 13:40:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1456326

Title:
  XServer eats up 100% cpu and is very slow on specific tasks with xfce
  desktop

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  I am using xfce desktop.

  Issue:

  When I want to log out, after clicking on the log-out button from the
  start menu (that one which looks like the power button on a tv-
  remote), nothing happens for several seconds before the window to
  confirm the logout/lock screen/shutdown appears and the X process is
  eating up 100% CPU during that time.

  The same issue I have experienced when I took the screenshot: After
  pressing the key combination to take a screenshot, I had to wait
  several seconds before the screenshot has been presented. During the
  waiting period, 100% CPU was used.

  Even some other things seem to react somehow sluggishly while others are working as expected.
  But when logging out, it is always annoying to wait so long for the window to choose to log out/lock the screen/shutdown. 

  Expected behaviour:
  * The logout window is displayed immediately (as before).
  * The Screenshot is displayed immediately after taking it.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  ProcVersionSignature: Ubuntu 3.13.0-52.86-generic 3.13.11-ckt18
  Uname: Linux 3.13.0-52-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Mon May 18 22:09:46 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8280] [1002:9836] (prog-if 00 [VGA controller])
     Subsystem: ASRock Incorporation Device [1849:9836]
  InstallationDate: Installed on 2014-02-25 (446 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-52-generic root=UUID=5e706392-b33a-488d-bd51-fc1d86c7ed43 ro quiet splash vt.handoff=7
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.10
  dmi.board.name: AM1B-ITX
  dmi.board.vendor: ASRock
  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.:bvrP1.10:bd02/21/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnAM1B-ITX:rvr: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 1:0.9.11.3+14.04.20150313-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.6
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Mon May 18 21:30:52 2015
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Lite-On Technology Corp. ThinkPad USB Keyboard with TrackPoint KEYBOARD, id 8
   input        Lite-On Technology Corp. ThinkPad USB Keyboard with TrackPoint KEYBOARD, id 9
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs: Output                                  HDMI-0          HDMI-1           VGA-0
  xserver.version: 2:1.15.1-0ubuntu2.7
  xserver.video_driver: radeon

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