Does the Quantenna driver report the powersavings flag?Asus upgraded lighttpd to a newer version with GPL 2697, it's possible they removed the modules they didn't need, for security reasons (as lighttpd is only used for AiCloud). I'll have to check if it's possible to re-enable it.
No idea what that message is, or what it refers to.
MU-MIMO support. They might have also (finally?) resolved the power drain issues with Android devices.