Thanks Shaneee for the tip.
I tried disable XLNCUSBFix.kext, both with and without GenericUSBXHCI.kext, it doesn't work.
Once XLNCUSBFix.kext is remove. I saw tons of "HCHalted did not set as expected:" error (see attached screenshot).
Since this is USB2.0 (black port), I think it is related...
In 10.14, I am unable to get USB2.0(EHCI) working, only USB1.2(OHCI) get loaded. so web cam is super slow.
It seems EHCI is blocked by XLNCUSBFix.kext completely that AppleUSBEHCI.kext is unable to attach to it?
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