This happens to me with the nvidia, the nv, and the nouveau driver.
Here's another thing I noticed: when I have the issue, xorg is not able to open 
the acpid socket:

(WW) Open ACPI failed (/var/run/acpid.socket) (No such file or
directory)

If I log out and log back in, things go back to normal:

(II) Open ACPI successful (/var/run/acpid.socket) and cpu usage is
normal.

-- 
[karmic] Xorg 100% CPU utilization -- only after first login
https://bugs.launchpad.net/bugs/439138
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