Hibernation - Compal JHL90 Service Manual

JHL90 Service Manual
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 stops clock state. The CPU stays in this state
until an interrupt occurs.
5.4.2 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.
5.4.3 Display Device
The monitor can be turned off after a period of no activity based on the settings of
the OS.
5.4.4 System Wake Up Sources
The table below lists the wake up events for all low power states:
Events
Any key
Power button
LAN (On board)
RTC
Critical low battery
Field 'Process Required' identifies that further process for the occurred events
must be processed during wake up or resume procedure.
5.4.4.1 LAN
• LAN (On board)
The function of waking up the system from standby (DC/AC) / hibernation (AC
mode) is supported.
5.4.4.2 Real Time Clock Alarm
The Real Time Clock alarm interrupt will wake the system from Standby (DC/AC)
/ Hibernation (AC mode)
5.4.4.3 Critical Low Battery
Critical low battery event can wake the system from Standby (DC mode) in ACPI
mode.
5.5

Hibernation

To support the hibernate state, the save to disk partition or file will be created by
the operating system if the user select to enable the hibernation.
It is the responsibility of the operating system to save the system state to a disk
file and restore the system state when it is turned back on.
2-8
S3 S4
O X
O O
O O
O O
O X
S5 Process required
X X
O X
X O
X O
X O