Compal ACY25 series, Service Manual

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Chapter 2-7
reduced in an effort to reduce heat generation. The second type is active cooling where a fan
is turned on to cool the system.
In non-ACPI mode(Legacy Mode), the thermal management is achieved by controlling the fan
depend on the temperature. Besides turning the fan on and off. The system may also be
shut off whenever the temperature can’t be reduced even the fan are spinning in the full
speed. The system will be turned off immediately when it’s over-heating (over 85
°
C). The fan
will be turned off when temperature is under 65
°
C. The table below listed the control point of
temperature changes:
Temperature Fan Off Fan on(100%) System Off
< 62
℃
X
65
℃
X
> 85
℃
X
Power Management
Introduction
The notebook supports ACPI power management modes. The system will dynamically switch
to ACPI mode for configuration and power management when an ACPI OS is loaded.
System Time-outs
The system Time-outs include the Standby time-out, the Suspend time-out, and the Hibernate
time-out.
System Time-outs are handled by the operating system in ACPI mode. BIOS time-outs must
be disabled. System time-outs are set using the control panel power applet.
System Power Management
The overall system can be in one of five system power states as described below:
Legacy Mode ACPI mode Power Management
Off Mech. Off (G3) All devices in the system are turned off
completely.
Soft Off (G2/S5) OS initiated shutdown. All devices in the system
are turned off completely.
On Working (G0/S0) Individual devices such as the CPU and hard
disk may be power managed in this state.
Standby (S1) CPU in Stop Clock state
VGA Standby, turn off backlite
PCMCIA Standby
Audio Power Down
Hard Disk Spin Down motor
Super I/O Low Power Mode
Suspend to RAM (S3) CPU set power down
VGA Suspend
PCMCIA Suspend
Audio Power Down
Hard Disk Power Down
CD-ROM Power Down
Super I/O Low Power mode
Save to Disk (S4) Also called Hibernate state. System Saves all
system states and data onto disk prior to power
off the whole system.