Re: VDPAU Error: DISPLAY PRE-EMPTED
1 question: Do you know roughly what bit-rate the streams are that you're decoding with VDPAU when you see these preemptions?
A couple things for you to try: a) Disable AGP, since your graphics cards are PCI (maybe there's a BIOS option for this; no idea). b) Use the NvAGP driver instead of AGPGART. Chapter 12 in the Linux README appears to deal with this.