I've build  RT kernel 4.19 for my bbb and Debian buster. 
Linux beaglebone 4.19.94+ #1 SMP PREEMPT RT Sun Apr 26 11:04:37 CEST 2020 
armv7l GNU/Linux

I use wifi USB stick with kernel module mt760u and it works great.
After switching of USB power I'm flooded with messages:

[   75.890362] mt7601u 1-1:1.0: Vendor request req:07 off:1700 failed:-110
[   79.122377] mt7601u 1-1:1.0: Vendor request req:07 off:1704 failed:-110
[   82.354362] mt7601u 1-1:1.0: Vendor request req:07 off:1708 failed:-110
[   85.586380] mt7601u 1-1:1.0: Vendor request req:07 off:101c failed:-110
[   88.818362] mt7601u 1-1:1.0: Vendor request req:07 off:170c failed:-110
[   92.050380] mt7601u 1-1:1.0: Vendor request req:07 off:101c failed:-110
[   95.282362] mt7601u 1-1:1.0: Vendor request req:07 off:1710 failed:-110


I cannot even switched off my bbb using onboard power button. Why there is 
no normal transition from USB to battery power?
How could I fixed this for my board?
Thanks, 

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