Patent ID: 8893265

Claim:
An apparatus for waking up a computer system, wherein the apparatus is electrically coupled to a south bridge having a first USB host interface, the apparatus comprising: a second USB host interface; a switch element, for electrically coupling a USB keyboard to either the first USB host interface or the second USB host interface; a control element, electrically coupled to the second USB host interface and the switch element, wherein the control element has a memory element for storing a predetermined password; and a wake-up element, electrically coupled to the control element; wherein when the computer system enters a suspend-to-ram mode, a suspend-to-disk mode or a shutdown mode, the control element controls the switch element to electrically couple the USB keyboard to the second USB host interface; wherein when a user inputs a password with the USB keyboard, the second USB host interface receives the password and transfers the password to the control element, wherein the control element fetches the predetermined password from the memory element and compares the password with the predetermined password; and if the password matches the predetermined password, the control element controls the wake-up element to wake up the computer system; and wherein when the computer system is woken up, the control element controls the switch element to electrically couple the USB keyboard to the first USB host interface.