Asus M4A78 Pro - Manual (Page 30)

2. Keyboard power (3-pin KBPWR)
This jumper allows you to enable or disable the keyboard wake-up feature. Set
this jumper to pins 2-3 (+5VSB) to wake up the computer by pressing a key on the
keyboard (the default is the Space Bar). This feature requires an ATX power supply
that can supply at least 1A on the +5VSB lead, and a corresponding setting in the
BIOS.
3. USB device wake-up (3-pin USBPW1-4, USBPW5-8, USBPW9-12)
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 USBPW1-4
jumpers are for the rear USB ports. The USBPW5-8 and USBPW9-12 jumpers are for
the internal USB connectors that you connect to additional USB ports.
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