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When "USB 2.0 controller" is disabled in BIOS, I noticed some USB ports are not available.

Related Model ( 2024 )

This is chipset limitation. ICH9 embedded two EHCI Host Controllers and six UHCI Host Controllers, supporting up to twelve USB ports.
When USB 2.0 controller is (set) disabled , EHCI #2(EHCI Host Controllers)and UHCI#4 ,UHCI#5 ,UHCI#6(UHCI Host Controllers) are not available.
Therefore, rear USB ports are not available and only front USB ports are available.
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