Description of problem:
I'm running 2.6.16-1.2080_FC5xen0 on a ThinkPad T41 (Radeon Mobility M7.) 
Without about 3 minutes of logging into X, I get screen corruption in the
upper-left corner of the display (screenshot attached.)  If I cause the area to
refresh, the corruption goes away, but slowly creeps back over a period of time
(a few minutes to get fully corrupted.) 

Another interesting note is this happens with both the radeonfb module loaded
and unloaded.

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