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If anyone would care to share a board-specific step by step tutorial for how to disable unused USB ports on the UD5 and High Sierra to come in under the 15 port limit, I'd love to see it!
The USB ports are awfully flakey as is!
@map002ster Did you see the great guide from @dracon here? All three of us have the same board:
You can find an template UIAC (USB Inject All Configuration) for the Z270X-UD5 board with comments on what each port does at:
https://github.com/andrewmiskell/Series-200-Patches/blob/master/SSDT-UIAC-Z270X-UD5.dsl
You'll just need to comment out or remove the ports you don't use and set the UsbConnector value to 255 if it's an internal port (the proper connector types for everything else are already set). The comments indicate the rear port or in the case of internal headers the name of the header (as described in the manual for the motherboard and written on the motherboard itself).
Also, I'm using the very latest BIOS version from Gigabyte for this board (F5), I'd suggest upgrading to that as well if you aren't already on the latest version.