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

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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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