Dell Latitude XPi Service Manual - Page 13

Keyboard Indicators, Controlling Computer Power, Power States

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Keyboard Indicators The keyboard controls the operation of the numeric lock (Num Lock) indicator, the capitals lock (Caps Lock) indicator, and the Scroll Lock indicator, all of which are visible through apertures at the top of the keyboard. These indicators are associated with the key, the key, and the key; when lit, the LEDs indicate the active state of these keys. Controlling Computer Power The power button does not directly control power to the computer. Instead, when you slide the power button toward the front of the computer and then release it, the button momentarily closes the power switch on the system board. The power switch sends a signal to the power management controller, signaling the controller to initiate a change of state of the computer's power. The resulting power state depends on the present power state. The following subsection gives a description of the power states. Power States Sliding the power button toward the front of the computer initiates a change from the current power state to a different state. The protocols for the power state changes are as follows: • If the computer is off (no indicators on) and the display is open and/or an external monitor is attached to the computer, sliding the power button initiates a boot operation. • If the computer is off, if the display is closed, and if no external monitor is attached, sliding the power button causes the computer to run the POST and then turn off. • If the computer is on and the SYSTEM SWITCH option in System Setup is set to ON/OFF, sliding the power button turns off the computer. • If the computer is on and the SYSTEM SWITCH option in System Setup is set to S2D/RFD, sliding the power button causes the computer to enter suspendto-disk mode. • If the computer is in suspend mode (the power/suspend indicator flashes every 8 seconds), if the SYSTEM SWITCH option in System Setup is set to ON/OFF, and if the display is open or an external monitor is attached, sliding the power button turns off the computer. • If the computer is in suspend mode (the power/suspend indicator flashes every 8 seconds), if the SYSTEM SWITCH option in System Setup is set to S2D/RFD, and if the display is open or an external monitor is attached, sliding the power button causes the computer to enter suspend-to-disk mode. System Overview 1-5

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System Overview
1-5
Keyboard Indicators
The keyboard controls the operation of the numeric lock (Num Lock) indicator,
the capitals lock (Caps Lock) indicator, and the Scroll Lock indicator, all of
which are visible through apertures at the top of the keyboard. These indicators
are associated with the <NUM LOCK> key, the <CAPS LOCK> key, and the
<SCROLL LOCK> key; when lit, the LEDs indicate the active state of these
keys.
C
ontrolling Computer Power
The power button does not directly control power to the computer. Instead,
when you slide the power button toward the front of the computer and then
release it, the button momentarily closes the power switch on the system board.
The power switch sends a signal to the power management controller, signaling
the controller to initiate a change of state of the computer’s power. The resulting
power state depends on the present power state. The following subsection gives
a description of the power states.
Power States
Sliding the power button toward the front of the computer initiates a change
from the current power state to a different state. The protocols for the power
state changes are as follows:
•
If the computer is off (no indicators on) and the display is open and/or an
external monitor is attached to the computer, sliding the power button ini-
tiates a boot operation.
•
If the computer is off, if the display is closed, and if no external monitor is
attached, sliding the power button causes the computer to run the POST and
then turn off.
•
If the computer is on and the
SYSTEM SWITCH
option in System Setup is set
to
ON/OFF
, sliding the power button turns off the computer.
•
If the computer is on and the
SYSTEM SWITCH
option in System Setup is set
to
S2D/RFD
, sliding the power button causes the computer to enter suspend-
to-disk mode.
•
If the computer is in suspend mode (the power/suspend indicator flashes
every 8 seconds), if the
SYSTEM SWITCH
option in System Setup is set to
ON/OFF
, and if the display is open or an external monitor is attached, sliding
the power button turns off the computer.
•
If the computer is in suspend mode (the power/suspend indicator flashes
every 8 seconds), if the
SYSTEM SWITCH
option in System Setup is set to
S2D/RFD
, and if the display is open or an external monitor is attached, sliding
the power button causes the computer to enter suspend-to-disk mode.