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SubjectRe: AGP backport from 2.5 to 2.4.21-pre4
I tested on an Asus A7V8X motherboard (KT400) with a GeForce4 Ti 4200 
AGP8X. The module loads correctly, at last! It sets the apperture size
correctly and all, but when I start XFree, I get do not get any
graphical screen, but text mode garbage. Characters of all colors, with
no sense at all. I had exactly the same problem in other kernels.

I played a bit with the NvAGP option on XF86Config file. According to
the documentation, 0 is PCI mode, 1 is NvAGP or fallback to PCI if
failed, 2 is AGPGART mode or fallback to PCI if failed, 3 is autodetect.
If I set it to 2, 3 or comment it, I got the same problem with the
garbage and had to reset the PC. Setting it to 0 would make it run in
PCI mode, and it always works. I tried setting it to 1, thinking that
maybe the documentation is wrong. X started successfully, but the card
was in PCI mode. I read the logs to confirm it, and indeed, the NvAGP
module fails to identify the AGP chipset and falls back to PCI.

I tried setting NvAGP to 2 again, to read the logs and see if there is
something I could find out, but unfortunately the log had nothing but
garbage. I tried several times with no success. The log is always garbage.

- Sheng Long Gradilla

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