OS X 10.11 El Capitan has brought some serious incompatibility issues to some motherboards like my X79 Asus Rampage IV Black Edition and many others.
First let me give credit to Stinga11, pokenguyen, RehabMan and all the others who have spent time mapping out this problem. Also to PikeRAlpha, Revogirl, Master Chief, RehabMan and dgsa for all I have learned from them about ACPI.
EDIT: RehabMan explains this problem much better in his post...
X79 USB 2.0 in El Capitan 10.11
First let me give credit to Stinga11, pokenguyen, RehabMan and all the others who have spent time mapping out this problem. Also to PikeRAlpha, Revogirl, Master Chief, RehabMan and dgsa for all I have learned from them about ACPI.
EDIT: RehabMan explains this problem much better in his post...
X79 USB 2.0 in El Capitan 10.11