I have exactly the same problem with or without agpgart with 2.4.22 . I have a Geforce 4 MX440 on Mandrake 9.1
I think it is a bug in Nvidia X server and I bet those screwballs don't even know about it. It is unusable. I'm back to my old ATI card. I have seen the same problem on redhat on Dell with Quadro FX500
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