xorg consumes 100% CPU

[Grover Blue]

I'm a gentoo user, and I've been having problems with X eating 100% of the
CPU and freezing my system.  I'm not the only one, and we've been trying to
determine the cause.

http://forums.gentoo.org/viewtopic-t-559068-postdays-0-postorder-asc-start-0.html

Has anyone else been experiencing this?  Can you help us out?
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