I know something somewhere isn't right because I get a kernel panic anytime I modprobe a kernel module that relates to a device in the southbridge.
Any device, or just the AC'97? Same backtrace?
Unable to handle kernel paging request at virtual address 019b2005
[<c012a27c>] __request_region+0x52/0x74 [<c01f02a0>] pci_request_region+0x82/0xf2 [<c01f033c>] pci_request_regions+0x14/0x37 [<f8858c73>] snd_intel8x0_create+0x104/0x403 [snd_intel8x0]
Try to figure out where that bad address came from (add some printk's)?
Segher