Add following to your "Device" section in X config:
Option "NvAGP" "3"
if it doesn't help try changing 3 to 1 or 2
3 means NVidia driver tries to use agpgart, if it fails, it tries to use nvagp,
1 to force use nvagp, and 2 to force use agpgart
(or 2 to force use nvagp and 1 to use agpgart??)
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