When I use ath9k-htc, I always need to first create a hotspot, then disable the hotspot and re-connect to WLAN. It's because that ath9k-htc firmware (albeit free/libre) doesn't work with MAC randomization. And this is why I always suggest that PCI/e-based ath5k/9k be used whenever possible (i.e. not restricted by firmware whitelist).

I have a single-antenna super low-end AR2427 from Asus eeePC, and it's still much better than AR9271.

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