Asus M2N DH - Manual (Page 43)

ASUS M2N / M2N DH 2-2
3. 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 when you press
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.
R
M2N/M2N DH Keyboard Power Setting
(Default)
1
2 2
3
+5V +5VSB
KBPWR