5.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) if you wish 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 (see section 4.5.1 Power Up Control). The default is setting is on pins 2-3 (+5VSB).
P4B-E Keyboard Power Setting
Figure 2-26 Keyboard Power Settings6.Speaker selector (3-pin SPEECH) (on audio models only)
This jumper allows you to select the speaker you wish to use for the ASUS POST Reporterª function. Set to pins 1-2 to use the internal speaker (usually included in the chassis). Set to pins 2-3 if you connected an external speaker to the Line Out jack (lime color) on the rear panel.
SPEAKER LINE_OUT (Default)
P4B-E Speaker SelectorFigure 2-27 Speaker Selection Settings
ASUS P4B-E motherboard user guide