Patent ID: 7467308

Claim:
A method for transmitting a power-saving mode command of a computer system, comprising: transmitting an initial Ready-Enter-Power-Saving-Mode (REPSM) command between a central processing unit (CPU) and a second system chip in an initial step; executing the REPSM command, whereby a peripheral device coupled with the second system chip starts to enter a power-saving mode; transmitting an Enter-Power-Saving-Mode (EPSM) command to a first system chip from the second system chip; executing the system command, whereby a peripheral device coupled with the first system chip enters the power-saving mode, the first system chip informing the second system chip that the peripheral device coupled with the first system chip has executed the EPSM command; and in response to the first chip informing the second system chip, completing driving the peripheral device coupled with the second system chip into the power-saving mode.