I've have this board running under Dapper 32-bits and I'm getting the same problem. I've set aperture to 32M doesn't works. However, Dapper AMD64 with k8 kernel detects and sets aperture correctly.
-- AGPGART related issue's in combination of ASUS motherboard https://launchpad.net/bugs/29813 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs