kede, I have asked the same but concluded that AGP is black magic. Some proprietary drivers seem to get away with it, but I think the problem is the hardware does not fully comply with the AGP specifications and only the manufacturers know how. I was hoping AMD/ATI opening up would help with this, but almost all their resources (logically) goes towards newer hardware using PCI-E etc.
kede, I have asked the same but concluded that AGP is black magic. Some proprietary drivers seem to get away with it, but I think the problem is the hardware does not fully comply with the AGP specifications and only the manufacturers know how. I was hoping AMD/ATI opening up would help with this, but almost all their resources (logically) goes towards newer hardware using PCI-E etc.