This bug is 10 years old and should remain closed.

Please open a new bug if you have any problems.

** Changed in: xorg-server (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/294972

Title:
  xorg high cpu usage, system sluggishness

Status in xorg-server package in Ubuntu:
  Invalid

Bug description:
  Sometimes Xorg is shown in htop, top, ps, etc. as having a higher than
  expected CPU load.  Perhaps 100%, 50%, 10-20%...  Higher than the 1-5%
  that you normally expect.

  Sometimes this is accompanied by general system sluggishness,
  sometimes the fan runs at full tilt.

  This is not a single specific bug but rather is a generic symptom that
  can be caused by a wide variety of different underlying problems.
  This bug report is left open just as a placeholder and point for
  general discussion about this class of issue.

  In general, MOST of the time the issue is NOT X, but rather a client
  program that is just out of control making X calls.  X is a server and
  just responds to client requests as best it can.  If a client app is
  going nuts, like making a really expensive X call every few seconds,
  you'll see the high CPU indicated against X, even though the problem
  is really the client application's poorly optimized algorithm.

  A troubleshooting guide for this class of problem is available here:

     https://wiki.ubuntu.com/X/Troubleshooting/HighCPU

  Usually by starting or killing various programs, daemons, services,
  and so on you can narrow in on what is causing the load.

  Remember, your high CPU is probably NOT caused by X, so figure out
  which application is driving X, and file a new bug against THAT
  package.


  [Original Report]
  After the recent upgrade to 8.10 via update-manager -d, my whole system is 
quite laggy.

  Xorg now sits at the top of the cpu usage list constantly using 10 -
  20%, whereas under hardy it would sit at 1-2%.

  Opening programs can be at times quite slow, for instance, gedit can
  take 10+ seconds to open and load a txt file.

  Xorg.0.log seems normal enough till the end where I'll get several
  lines like this:

  AUDIT: Fri Nov  7 10:05:47 2008: 6071 X: client 4 rejected from local
  host ( uid=0 gid=0 pid=6545 )

  System:
  Linux WORKSHOP 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 
GNU/Linux
  P4 3.4Ghz,
  1 Gb RAM,
  Nvidia 8400gs with the 177 driver

  I'm not sure what other info is required, I'm sure someone will let me
  know...

  others possibly having the same issues:

  http://ubuntuforums.org/showthread.php?t=966629
  http://ubuntuforums.org/showthread.php?t=967839
  http://ubuntuforums.org/showthread.php?t=970714
  http://ubuntuforums.org/showthread.php?t=965897

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