@Akkana Peck, can you please install these packages:
xserver-xorg-video-ati-dbg xserver-xorg-core-dbg libgl1-mesa-dri-dbg 
libgl1-mesa-dri-glx
...and then sample 2-3 stacks from xorg while it's spinning the CPU and attach 
that to this bug.

Can you also try separately if:
Option "AccelMethod" "XAA"
...makes the problems go away.

And then remove the XAA option and add this one instead:
Option "DRI" "off"
...and see if that makes the issue go away (checking this helps us narrow down 
in what part of xorg the bug is hiding).

-- 
runaway Xorg in drmDMA() (radeon)
https://bugs.launchpad.net/bugs/347078
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