ASRock X99 Extreme6/ac User Manual - Page 99
USB Controller, Intel USB 3.0 Mode, Legacy USB Support, Legacy USB 3.0 Support
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4.4.6 USB Coniguration X99 Extreme6/ac / X99 Extreme6 USB Controller Enable or disable all the USB ports. Intel USB 3.0 Mode Select Intel® USB 3.0 controller mode. Set [Smart Auto] to keep the USB 3.0 driver enabled ater rebooting (USB 3.0 is enabled in BIOS). Set [Auto] to automatically enable the USB 3.0 driver ater entering the OS (USB 3.0 is disabled in BIOS). Set [Enabled] to keep the USB 3.0 driver enabled (Must install driver to use USB devices under Windows® 7). Set [Disabled] to disable the USB 3.0 ports. Legacy USB Support Enable or disable Legacy OS Support for USB 2.0 devices. If you encounter USB compatibility issues it is recommended to disable legacy USB support. Select UEFI Setup Only to support USB devices under the UEFI setup and Windows/Linux operating systems only. Legacy USB 3.0 Support Enable or disable Legacy OS Support for USB 3.0 devices. If you encounter USB compatibility issues it is recommended to disable legacy USB support. Select UEFI Setup Only to support USB devices under the UEFI setup and Windows/Linux operating systems only. 93 English