Miniport is an old concept resembling to virtual wifi adapters, I guess, and as such a driver concept that
normally is unnecessary for us mere mortals to deal with :-)
Otherwise, I,m really sorry to say that fiddling with the virtual adapter power save settings DIDN'T solve my headache, as I got this "No internet access" after some 16 hours :-(
Now, what I wonder about, is the REAL difference between "Limited access" and "No internet access". Is it introduced some logic, that checks beyond "link up" whether the WiFi connection results in a reachable Internet - which turns on/off some of these flags?
Earlier on, even on XP/Win7, a misconfigured network, resulting in unreachable DNS service, bad IP or a bad route / out from a broadband connection has given me that kind of diagnostic earlier on. I wonder whether there is now introduced in Win8 a semi-intelligent
mechanism (not) that actually fails (compared to my other wifi devices, that really operate OK) and decides to mark my wifi connection as useless, the same way as if I had misconfigured it...???