Yes, powertop output seems somehow screwed up. Not sure whether it's a bug in powertop or some inconsistency in kernel ABI via sysfs, but the result doesn't look reliable, in anyway. We'd still like to fix any real issue; it'd be helpful if you can test other kernel (e.g. from Fedroa) on top of the TW system and see whether it really saves the power. Once confirmed, we may confirm the difference of kernel configs that may matter.