This is from memory, so could be wrong...
When I built a kernel (so I could get a custom logo) I noticed a few config options.
I think they were empeg audio and empeg display (both were set off in the default script)
Maybe they aren't enabled on the developer release?
If I'm talking rubbish, feel free to correct me... =)

Jazz
(List 112, S/N 00030, 4 gig blue)