The only thing unusual I see in the dump is that the Asmedia 0x1042 does not support 64-bit physical addressing. I haven't really tested that condition. So what I'll do is simulate it with the xhci chip I have, and see if it screwes things up.
Thats interesting, am I the first Asmedia user? Let me know if you want me to test anything on the actual system if you don't want to simulate anything. Thanks for looking into it