8c03e55dd2
This adds a workaround to incorrectly behaving APs (ie, FreeBSD APs) which don't beacon out exactly when they should (at TBTT multiples of beacon intervals.) It forces the hardware awake (but leaves it in network-sleep so self generated frames still state that the hardware is asleep!) and will remain awake until the next sleep transition driven by net80211. That way if the beacons are just at the wrong interval, we get a much better chance of hearing more consecutive beacons before we go to sleep, thus not constantly disconnecting. Tested: * AR9485, STA mode, against a misbehaving FreeBSD AP.
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