I have one mt76x2u (Alfa AWUS036ACM) and a few mt76x0.

I've noticed two additional issues in my testing.

First issue, is that it appears the mt76x0 devices don't work properly
in monitor mode.  Sometimes they seem to monitor one channel properly,
but nothing else.  The mt76x2u works great, channel control, lots of
packets, etc.

Could you elaborate a little bit please? how can you reproduce the issue?
just add an interface in monitor mode and run a scan?

Second issue, and frankly a very minor one, is that the TP-Link T1U
(which is a 5GHz only device) still thinks it has support for 2.4GHz,
both in managed and monitor mode.

I guess it depends on eeprom values. Could you please enable debug
messages a paste
syslog output?

Lastly, I already mentioned in the other thread, but it would be
awesome if firmware version was available to ethtool.

Ack, I will take care of it
Regards,

Lorenzo

Thanks for all your hard work on this,
Zero