RehabMan
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Sorry for the double post i just wanted to update you with my findings under 10.10.5 (not 10.11)
i was messing around with some dsdt edits and now my usb3 devices show up properly in system information.
without any clover injections or extra kexts.
I don't know if the edits are correct and if this will work in 10.11 maybe someone else could let me know.
First thing i did was to change XHC to XHC1 and then i edited the addresses of usb3 ports like this:
from "Return (Add (XSPA, Zero))" to "Return (Zero)" up to "Return (0x05)"
i tested some usb3 sticks and the speed is good.
If the edits are wrong please let me know.
You'll need to do something different in 10.11...
What was the value of XSPA? (use ACPIDebug.kext).
Try without XHC->XHC1 rename to see if it was a factor or not.