3.4.3 Power States transition event
The following table summarizes the entry events and wake-up events of each power:
The following table summarize the entry events and wake-up events of each power state
Power State
Entry Event
Wake up Event
S3
OSPM control
Lid Close
Power Button
Sleep Button
Battery Low
Power Button
Ring Wake up
RTC Alarm
LAN Wake Up
Lid open
S4
OSPM control,
Power button
Sleep button
Lid Close
Battery Low
Power Button
RTC Alarm
S5
Power Button
Battery Low
OSPM control
Power Button
x OSPM: OS-directed Power Management
Device Power Control Methodology
Power state of local devices table
This section illustrates the power control status of each key device/component of the
system under each power management mode.
PowerState
Component
Doze Stand By
STR
STD/SOff
CPU
Stop
Grant
Stop Clock
Power Off
Power Off
L2 CACHE
ON
Power Down Power Off
Power Off
MontaraGM
ON
Stop Clock
Power Off (except
Vcc)
Power Off
ICH4
ON
ON
Power Off (except
SUSVcc, RTCVcc )
Power Off (except
SUSVcc, RTCVcc)
DRAM
ON
Self Refresh Self Refresh
Power Off
Clock Synthesizer ON
Low Power
Power Off
Power Off
CDROM
ON
Power Down Power Off
Power Off
HDD
ON
Power Down Power Off
Power Off
FDD
ON
Power Down Power Off
Power Off
KBC
ON
ON
Power Down
Power Off
PMU08
ON
ON
Power Down
Power Down
VGA/VRAM
ON
Power Down Power Down
Power Off
PCMCIA
ON
Power Down Power Down
Power Off
AUDIO
ON
Power Down Power Off
Power Off
Audio AMP
ON
Power Down Power Off
Power Off
LCD Backlight
ON
Power Off
Power Off
Power Off
TECHNICAL SERVICE MANUAL
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