disk prior to power off the whole system.
4.6.4 Device Power Management
Under ACPI mode, the device specific power management supported by this
notebook includes the CPU throttling, monitor power management and the hard disk.
4.6.4.1 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, C3 up to C7) 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 stops clock state.
The CPU stays in this state until an interrupt occurs.
4.6.4.2 Hard Disk
The operating system uses the spin down timer of the hard drive to set time-outs.
The BIOS time-out of the hard disk must be disabled in ACPI mode. The user can
sets the hard disk spin down time-out in the control panel power applet.
4.6.4.3 Display Device
The monitor can be turned off after a period of no activity based on the settings of the
OS.
4.6.4.4 System Wake Up Sources
The table below lists the wake up events for all low power states:
Events S3 S4 S5 Process
required
Internal Keyboard Yes No No No
Internal pointing device No No No No
USB No No No No
Lid Switch No No No No
Power button Yes Yes Yes No
LAN (On board) Yes Yes(AC mode only)
Yes(AC mode only)
No (For Win8 OS)
Yes
RTC Yes Yes(AC mode only) Yes(AC mode only) Yes
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