Xorg - High CPU - Desktop hung

[Alan J. Gagne]

> Since no one else is reporting this (at least not that I have seen),
> it is probably caused by the graphics chip driver used by Xorg.
> What is your graphics chip brand and model?

lspci | grep VGA
01:00.0 VGA compatible controller: nVidia Corporation NV34M [GeForce FX 
Go5200 64M] (rev a1)

Using nouveau driver, no xorg.conf.

Looks a lot like Bug 559791.