agpgart failure on KT400

Jonathan Morton
2003-08-14T18:38:20Z

I recently upgraded to a m/board using the KT400 chipset - specifically
an Abit KD7-G - and now find that I can't load agpgart. The relevant
kernel messages:

agpgart: Maximum main memory to use for agp memory: 941M
agpgart: Detected Via Apollo Pro KT400 chipset
agpgart: unable to determine aperture size.

This results in my inability to load XFree86, using the proprietary ATI
drivers, which appear to require AGP support. Note that the same
problem appears using ATI's "internal agpgart module", just to show I
know the difference. The regular XFree86 drivers probably work without
AGP - I haven't bothered trying yet.

NB: I tried sending this to Jeff Hartmann, but his address at
precisioninsight.com is dead. Please CC me, I'm not subscribed to the
list. Better still, refer me to someone who actually knows what to do
about it.

The BIOS is set up for either a 256MB or 64MB AGP aperture - whichever
of the two settings makes no difference. The video card is a Radeon
9700 Pro, 128MB. The kernel configuration includes ACPI and
HIGHMEM-4GB support, if that is at all relevant.

This problem is identically present in 2.4.21 and 2.4.22-rc2.

I can provide extra information as needed, just ask. I have a feeling
someone's going to ask me for lspci output, but I'll leave that until
someone who knows what they're doing asks me.

--------------------------------------------------------------
from: Jonathan "Chromatix" Morton
mail: chromi@chromatix.demon.co.uk
website: http://www.chromatix.uklinux.net/
tagline: The key to knowledge is not to rely on people to teach you it.