agp disabled, kt400 chipset

[floam]

running gentoo linux, not totally sure, but I think as soon as I upgraded from my old kt266 to kt400 board my agp died, /proc/driver/nvidia/agp/status says its disabled, and nvdriver says cant verify agp or somthing in my x log. trying agpgart doesnt help. maybe nvagp doesnt have the new one listed or somthing so doesnt want to go on it?

of course, it could have absolutly nothing to do with the new chipset, I reinstalled gentoo for the new mobo and cpu, so obviously in the 15 hours involved compiling/installing gentoo i could have farked up easily somewhere.

[bwkaz]

Not all kernels support the KT400. You probably have to use agpgart, and also pass agp_try_unsupported=1 to it when it loads.

options agpgart agp_try_unsupported=1 in your modules.conf file will accomplish the parameter-passing nicely. And setting NvAgp to 2 (or 3) in your XF86Config-4 (or whatever) file will make your system use agpgart.

[floam]

ah ok. Hopefully itll be supported in the next version

[bwkaz]

Out of curiosity, what device ID does /proc/pci have listed for your north bridge?

If /proc/pci doesn't tell you the device ID (it's a 4-character string of digits and letters from a-f), then you can make a note of which device your north bridge is (first, second, third, whatever -- it should be first, but you never know), and then do a awk '{print $2;}' </proc/bus/pci/devices to get a list of the PCI IDs in your system. Your north bridge should be in the same place in this list as it's in in the /proc/pci list.

The interesting part of the PCI ID is the last 4 digits, the device ID. If you could let me know what that is, I can check in kernel 2.4.20-rc1 (the latest stable kernel) to see if it's supported yet.

[cogumbreiro]

kernel 2.4.21-pre2 already supports VIA KT400 northbridge