Introducing the BIOS
User’s Manual
4-19
System Level reference of S0, S1, or S2 are in the OFF state.
!
Devices states are compatible with the current Power Resource states. Only devices which solely
reference Power Resources which are in the ON state for a given device state can be in that device state.
In all other cases, the device is in the D3 (off) state.
!
Devices that are enabled to wake the system and that can do so from their current device state can
initiate a hardware event which transitions the system state to S0. This transition causes the processor
to begin execution at its boot location. The BIOS performs initialization of core functions as required to
exit an S3 state and passes control to the firmware resume vector. Please see the ACPI Specification
Rev. 1.0 book section 9.3.2 for more details on BIOS initialization.
From the software point of view, this state is functionally the same as the S2 state. The operational
difference can be that some Power Resources that could be left ON in the S2 state might not be available
to the S3 state. As such, additional devices can be required to be in logically lower D0, D1, D2, or D3
state for S3 than S2. Similarly, some device wake events can function in S2 but not S3.
Because the processor context can be lost while in the S3 state, the transition to the S3 state requires that
the operating software flush all dirty cache to DRAM.
+
Above information for system S1 were refer to ACPI Specification Rev. 1.0.
Video Off Option:
Select the saving mode in which the video is switched off.
®
Always On
The video will never be switched off in the “no power saving” mode.
®
Suspend
,
Off
The video will only be switched off in Suspend mode. (Default setting)
®
Susp,Stby
,
Off
The video will only be switched off in Suspend/Sytandby mode. (Default setting)
®
All Modes
,
Off
The video will be switched off in all power saving modes.
Video Off Method:
Three video off methods are available: Blank Screen
(
V/H SYNC + Blank
(
DPMS Supported. The
default is
DPMS Supported
.
If this setting does not shut off the screen, select
Blank Screen
. If your monitor and video card support
DMPS standard, select
DPMS Support
.
Modem Use IRQ:
Eight options are available: Auto
(
3
(
4
(
5
(
7
(
9
(
10
(
11
(
Back to NA. The default
setting is
Auto
. You can specify the IRQ for modem use.
