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[Timo-heister <1395547@xxxxxxxxxxxxxxxxxx>]

I have the same issue but with intel graphics. One difference is that
that the high load on Xorg goes away after about a minute and the system
behaves normally.

I can also produce this high load using 
    xmodmap -pke > .Xmodmap
    xmodmap ~/.Xmodmap

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https://bugs.launchpad.net/bugs/1395547

Title:
  xfsettingsd and xfce4-volumed using a lot of CPU after screen lock /
  unlock

Status in xfce4-settings:
  Confirmed
Status in xfce4-settings package in Ubuntu:
  Confirmed
Status in xfce4-volumed package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-ati package in Ubuntu:
  New

Bug description:
  Just upgraded to Xubuntu 14.10, had issues with fglrx (see
  http://askubuntu.com/questions/552795/xubuntu-14-10-upgrade-issues-
  with-fglrx), went back to radeon drivers. Now it looks to be OK,
  however after locking the screen using xflock4 and unlocking, I get
  these three processes using a lot of CPU (this is on 4-core Phenom II
  X4 N950):

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                                    
   1572 root      20   0  262892  56672  26480 R  89.7  1.4   6:48.70 Xorg                                                                                                       
   5025 usr       20   0  312116  11336   4632 R  36.9  0.3   0:17.42 xfce4-volumed                                                                                              
   5036 usr       20   0  327328  10556   5760 S  31.5  0.3   0:13.38 xfsettingsd          

  Additional information:

  - Killing and restarting xfsettingsd and xfce4-volumed resolves the issue until next sleep cycle
  - When running only xfce4-volumed, but not xfsettingsd, the issue does not appear
  - This can be reproduced always. ATI Radeon Mobility HD 5650 video card
  - The CPU usage does not seem to go down after a while
  - If I got it correctly, it looks like some other processes are also going to high CPU usage after killing xfce4-volumed. I think I saw xfce4-xkb-plugin going to 95% CPU usage
  - The issue happens before unlock, i.e. locking then pressing a key to get a login dialog, then switching to vty1 and doing a top yields the above

  Not sure what else I should check / post that can be useful for
  troubleshooting, let me know.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xfce4-settings 4.11.3-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Nov 23 18:34:02 2014
  InstallationDate: Installed on 2014-04-24 (213 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  SourcePackage: xfce4-settings
  UpgradeStatus: Upgraded to utopic on 2014-11-22 (0 days ago)

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