Asus Motherboard M2N-MX SE PLUS User Manual page 34

2. USB device wake-up (3-pin PS2_USBPW1-4, USBPW5-8)
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).
M2N-MX SE PLUS USB Device Wake Up
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M2N-MX SE PLUS
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.
PS2_USBPW1-4
USBPW5-8
Chapter 1: Product introduction