Specifications

Chapter 2-8
Device Power Management
The device specific power management supported by this notebook includes the CPU and the
hard disk.
CPU power management
• ACPI mode
The operating system detects when the system is idle and places the CPU in one of the 3
CPU low power states (C1, C2 or C3) depending on how much latency it believes the
system can afford.
The C1 state is simply the CPU halt instruction. The C2 state is the CPU stop grant state.
The C3 state is the CPU stop clock state. The CPU stays in this state until an interrupt
occurs.
Hard Disk
• ACPI mode
Newer OSes use the spin down timer of the hard drive to set time-outs. The user can sets
the hard disk spin down time-out in the control panel power applet.
System Wake Up Sources
The table below lists the wake up events for all low power states:
Events S1 S3 S4 Process required
Hot Key(*1) - - - -
Power button V V V -
Lid open V V - -
Lid close - - - -
Modem Ring (Mini-PCI Modem) V V - -
Modem Ring (USB/PCMCIA Modem) - - - -
Modem Ring (Serial Port Modem) - - - -
LAN (Mini-PCI NIC) V V - -
LAN (USB/PCMCIA NIC) - - - -
AC/Battery - - - V
Thermal - - - V
RTC V V - -
COM/LPT/KB/Mouse/FDD/HDD - - - -
Audio/Video activity - - - -
PCMCIA - - - Driver
USB(*2) - - - Driver
Module swap---Battery - - - V
Module swap---non Battery - - - V
CRT(no event) plug/unplug - - - V
Hot Plug PS/2 devices - - - KB only