Fujitsu Stylistic 3400 Technical Reference Manual page 83

Table describes system activity for each system power state and describes events that cause the system to
enter each state. System power states are listed here in decreasing order from higher to lower power
usage. The system can be configured to use some, all, or a combination of these system power states.
These states are described in more detail later in this chapter, see "Power Management States and BIOS
Configuration Options" on page 71. Also note that timeouts, such as the suspend timeout and hard disk
drive spin-down timeout can be configured separately in the BIOS or controlled by system or application
software through APM or ACPI.
System State
Fully On Mode System is running. CPU, system bus, and all
other active interfaces operate at full speed.
Idle Mode CPU speed reduced to the speed selected for
the Idle Mode CPU Speed BIOS option.
See "Idle Mode" on page 71 for more details
on Idle mode.
Standby Mode CPU enters stop-grant state (CPU stopped).
Hard disk drive enters standby state (spun
down).
Display and backlight are turned off.
Suspend-to- Resume system logic remains powered
RAM Mode* (Suspend/Resume button circuitry) and RAM
remains powered to maintain active data.
All other devices are powered off.
Save-to- Active system data is saved to the hard disk
Disk Mode* drive. (Data is saved to a partition or file
depending on save to disk configuration.)
System is fully powered off except for logic
components required for Suspend/Resume
button operation.
Off Mode System is fully powered off except for logic
components required for Suspend/Resume
button and real-time clock operation.
* The system can be configured to use Suspend-to-RAM mode or Save-to-Disk mode. See "Power Savings Menu
Options" on page 20 for more information. If Save-to-Disk is used, the system must have a save-to-disk partition or file,
see "PHDISK Hard Disk Preparation Utility" on page 27 for more information.
Table 7-2: System Power States
System Activity Events Causing System to Enter State
From Standby or Idle mode: user activity
detected.
From Off mode: system started.
From Suspend-to-RAM mode: system
operation resumed (Suspend/Resume button
pressed, resume on modem ring, resume on
time).
Idle mode timeout occurs. (No system activity
for 1/2 second.)
Note: The low battery warning condition (less
than 12% charge) will force the system to use
Idle mode. Low battery warning (audible beep)
is heard if Audio is enabled in the BIOS.
Standby timeout occurs.
Suspend timeout occurs.
Suspend request (issued by software or
Suspend/Resume button pressed).
Critically low battery. Note that a critically low
battery forces system into Suspend-to-RAM
mode regardless of the Suspend Mode setting
in the BIOS.
Suspend timeout occurs.
Suspend request (issued by software or
Suspend/Resume button pressed).
System shutdown.
Power States and State Transitions 70