I'm using AMD 64 in Ubuntu Edgy Eft Knot 3 32 bits version here and getting sort of the same problem.
The diference is that I'm trying to use the open source drivers. -- no dri cannot init AGP in 2.6.17-10 AMD64 https://launchpad.net/bugs/62547 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs