Xorg CPU hog

[Ralf M.]

The program "Xorg" eats up too much CPU, sometimes more than 50%,
the whole system gets slowed down, even the moving of the cursor
in a text editor gets very slow.
This behaviour started when I updated my Debian system:

uname -a
Linux comp109.local 2.6.30-1-686 #1 SMP Sat Aug 15 19:11:58 UTC 2009 i686 GNU/Linux

dpkg -l | grep xorg
ii  xorg                      1:7.3+20    X.Org X Window System
ii  xserver-xorg              1:7.3+20    the X.Org X server
ii  xserver-xorg-core         2:1.4.2-11  Xorg X server - core server
ii  xserver-xorg-input-kbd    1:1.3.1-1   X.Org X server -- keyboard input driver
ii  xserver-xorg-input-mouse  1:1.3.0-1   X.Org X server -- mouse input driver
ii  xserver-xorg-video-all    1:7.3+20    the X.Org X server -- output driver metapack
ii  xserver-xorg-video-...

Is there a solution available?