I can confirm it on Samsung X118 laptop - Intel 4500 - Ubuntu 9.10 "Karmic 
Koala" x86, "clean" install. 
I found about 70-75% Xorg CPU load after switching to native console mode - 
vt1, 2, etc. (Ctrl-Alt-F1,F2,etc) and back to vt7 (X11 Graphics mode).
Also I found same loading during about 10 - 15 seconds after wake up from 
"sleep" mode. The same situation is for both kernels: 2.6.31-17-generic and 
recently updated 2.6.31-19-generic.
Command in HTOP: /usr/bin/X ...

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High Xorg CPU usage?
https://bugs.launchpad.net/bugs/449196
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