Asus G1-P5G43 - Manual (Page 46)

4-4 Chapter 4: Motherboard info
2.. USB.device.wake-up.(3-pin.USBPW1-6,.USBPW7-12)
Set the jumpers to +5V to wake up the computer from S1 sleep mode (CPU
stopped, DRAM refreshed, system running in low power mode) using the
connected USB devices. Set to +5VSB to wake up from S3 and S4 sleep
modes (no power to CPU, DRAM in slow refresh, power supply in reduced
power mode). USBPW1-6 is for the rear USB ports. USBPW7-12 is for the
internal USB connectors that you can connect to additional USB ports.
3.. Keyboard.power.(3-pin.KBPWR)
This jumper allows you to enable or disable the keyboard wake-up feature.
When you set this jumper to pins 2–3 (+5VSB), you can wake up the
computer by pressing a key on the keyboard (the default is the Space Bar)s.
This feature requires an ATX power supply that can supply at least 1A on the
+5VSB lead, and a corresponding setting in the BIOS.