Asus P4SE/U2 - Manual (Page 21)

ASUS P4SE/U2 Motherboard 1-11
3. USB device wake-up (3-pin USBV1,USBV2,USBV3)
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 sleep mode
(no power to CPU, DRAM in slow refresh, power supply in reduced power
mode). Both jumpers are set to pins 1-2 (+5V) by default because not all
computers have the appropriate power supply to support this feature.
The USBPWR_12 and USBPWR_34 jumpers are for the rear USB port.
USBPWR_56 is for the internal USB header that you can connect to the front
USB ports.
P4SE/U2
®
P4SE/U2 USB Device Wake Up
USBV1
USBV2
+5V
1 2
+5VSB
2 3
(Default)
+5VSB
2
3
+5V
1
2
(Default)
USBV3
This feature requires a power supply that can provide at least 1A on the +5VSB
lead when these jumpers are set to +5VSB. Otherwise, the system does not
power up.
The total current consumed must NOT exceed the power supply capability
(+5VSB) whether under normal condition or in sleep mode.