Hi. Is it only the xorg process using high CPU? Usually you would see a
couple of processes with high CPU if xorg is busy.

Also....
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** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1101999

Title:
  After updates xorg consumes a lot of CPU when doing anything

Status in “xorg” package in Ubuntu:
  Incomplete

Bug description:
  I did a fresh install of 12.04 a couple of moth ago. Everything worked
  fine. I did the usual update via update-manager 2 days or so ago, were
  xorg packages were updated. Now when I do _anything_ xorg consumes
  between 40% and 60% CPU and the whole system is very slow and laggy.
  This happened after the reboot I did after updating. Maybe theres a
  connection?

  I'm using 12.04 with Gnome3. This is my graphiccontroller:

  00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 
945GT Express Memory Controller Hub (rev 03)
  00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 
943/940GML Express Integrated Graphics Controller (rev 03)
  00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 
943/940GML Express Integrated Graphics Controller (rev 03)

  It's a Dell Laptop.

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