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[vfio-users] USB enumeration (uPD720201)



Its extremely probable than your issue is unrelated to VFIO, Passthrough, or whatever. Besides than that USB Controller was one of the worst of the lot according to some googling, there are also fake/counterfeit versions of it of even lower quality that had multitude of issues:
http://club.dx.com/forums/forums.dx/threadid.918878

Basically, it can be that your USB controller PCIe card is total garbage. Try to do some googling to find out if the fake issues also applied to the uPD720201, and figure out if you can at least guarantee than the card is good, before trying to debug it Software side. 		 	   		  


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