Asus P5KEPU - Motherboard - ATX User Manual page 85

Legacy USB Support [Auto]
Allows you to enable or disable the support for legacy USB devices. Setting to
[Auto] allows the system to detect the presence of USB devices at startup. If
detected, the USB controller legacy mode is enabled. If no USB device is detected,
the legacy USB support is disabled.
Configuration options: [Disabled] [Enabled] [Auto]
ASUS P5K/EPU 4-21