Asus V3-P5G31 - Manual (Page 57)

4-4 Chapter 4: Motherboard info
2. USB device wake-up (3-pin PS2_USBPW)
Set these 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).
• The USB device wake-up feature requires a power supply that can
provide 500mA on the +5VSB lead for each USB port. Otherwise,
the system would not power up.
• The total current consumed must NOT exceed the power supply
capability (+5VSB) whether under normal condition or in sleep mode.
R
USB Device Wake Up
3
2 2
1
PS2_USBPW
(Default)
+5V +5VSB