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[Björn <586027@xxxxxxxxxxxxxxxxxx>]

I had a similar problem with the nvidia driver doing TwinView. The
X-server took every now and then a whole CPU core of two cores present.
Opposed to the bug report my system always recovered after some minutes.

Recently I found out about Qt's graphicssystem options raster and OpenGL
(see http://labs.qt.nokia.com/2009/12/16/qt-graphics-and-performance-an-
overview/). In short, the Qt people concentrate to improve the raster
system on all supported platforms because OpenGL has some drawbacks.

On the other hand at least the kubuntu people decided to set OpenGL as
default. They have some good reasons for that either.

I installed package kde-qt-config-graphicssystem and used it to switch
the graphicssystem from default to raster in KDE's system settings and
now all performance problems are blown away.

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https://bugs.launchpad.net/bugs/586027

Title:
  xserver causes extreme cpu-load unexpected [Lucid]

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