No luck. [1] For what it's worth, the TL-WN722N's LEDs did not light
up after executing `ip link set dev $device up`, so I am pretty sure
that the `echo none > ...` command worked. I do see that version 1.4
of the firmware may be released. [2] I can build and install the
firmware and see what happens. Is that worth doing? I'm not 100% which
firmware version is provided by your repo. [3]

[1] http://www.ichimonji10.name/downloads/2015-01-18.txt
[2] https://github.com/qca/open-ath9k-htc-firmware/issues/65
[3] https://github.com/olerem/ath9k-htc-firmware-blob

—Jeremy 'Ichimonji10' Audet