Acer Altos R920 Series - Manual (Page 131)

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USB Configuration
IRQ Set the interrupt request line for the serial
B port. 3
4
Parameter Description Option
Detected USB
Devices Indicates the number of USB devices.
USB Controller When enabled, all onboard USB controllers
will be turned on and accessible by the OS.
When disabled, all onboard USB
controllers will be turned off and
inaccessible by the OS.
Enabled
Disabled
Legacy USB
Support Enables or disables support for legacy USB
devices. Enabled
Disabled
Auto
Parameter Description Option