Re: Linux drivers broken on 3.6 series of kernels with amd IOMMU.
I found some people talking about bugs in older versions of the BIOS for the Asus 990FX MB so I've updated to the 10/16/12 release but it does not appear to have helped.
[ 13.095586] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 304.64 Tue Oct 30 10:58:20 PDT 2012
fairly long 20-30s delay
[ 529.404759] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016 address=0x00000000a9400000 flags=0x0030]
[ 529.404764] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0016 address=0x000000043562a000 flags=0x0010]
[ 537.452963] NVRM: RmInitAdapter failed! (0x27:0x38:1203)
[ 537.452972] NVRM: rm_init_adapter(0) failed
phenom ~ # ls /dev/nv*
/dev/nvidia1 is never created