Tomcat i925X S5130
Chapter 3: BIOS Setup
3-22
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3.7 Power Management Setup
Options related to power management can be altered through the following:
ACPI Function
If your system supports ACPI, then enable this ACPI function. ACPI (Advanced Configuration
and Power Interface) establishes industry-standard interfaces for OS-directed configuration
and power management on laptops, desktops, and servers.
ACPI allows the Operating System (instead of the BIOS) to control Power Management
(OSPM). The ACPI Standard defines hardware registers (which are implemented in chipset
silicon), BIOS interfaces, which include configuration tables, control methods, and
motherboard device enumeration and configuration; system and device power states, and the
APCI thermal model.
All devices in the system can communicate with each other about resource use. The operating
system has the most knowledge on a running system's state, and so is in the best position to
perform power management.
Enabled
/ Disabled
ACPI Suspend Type
This option specifies the method to be used hibernation. The options are as follows.
•
S1 (POS) (Power On Suspend):
In this method, the processor does not execute
instructions but remains connected to the bus; the processor preserves the state
and content of its internal registers, along with the dynamic context of the memory.
Only information about devices qualified as suitable to be woken up from hibernation
is kept by the processor. When a waking up event occurs, the devices that can wake
up the system force all the peripherals to be relinked.
•
S3 (STR) (Suspend To RAM): In this method, the processor does not execute
instructions. The state and content of the processor's internal registers is stored in
RAM along with the dynamic context of the memory. Information about devices
qualified as suitable to be woken up from hibernation is also stored in RAM. When a
waking up event occurs, the devices that can wake up the system restore the
contents of the registers of the processor from RAM and force all the peripherals to
be relinked.
•
S1 & S3 - In this method, the BIOS depends on the OS to select either S1 or S3.
