K-2SO
Very Senior Member
@K-2SO it is not a USB 2.0 limitation as he already states he gets 530Mbps normally.
It's a known behavior. Had to deal with it in the past. It starts as USB 3.0 then drops to USB 2.0. USB-AC68 is Realtek based. Old Realtek based ~2015. Native Realtek drivers have USB SF Mode and USB Switch Mode to deal with bus speed change. Realtek uses something called smart switching. Not really smart. Not smart at all with more than one device on the same controller.
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