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Chapter3
SE6
These device/events can wake up the
computer……
……from this state
Power switch
Sleeping mode or power off mode
RTC alarm
Sleeping mode or power off mode
LAN
Sleeping mode or power off mode
Modem
Sleeping mode or power off mode
IR command
Sleeping mode
USB
Sleeping mode
PS/2 keyboard
Sleeping mode
PS/2 mouse
Sleeping mode
Table 3-6-2: Effect of Pressing the Power Switch
If the system is in this
state……
……and the power switch
is pressed for
……the system enters this
state
Off
Less than four seconds
Power on
On
More than four seconds
Soft off/Suspend
On
Less than four seconds
Fail safe power off
Sleep
Less than four seconds
Wake up
ACPI Suspend Type:
Two options are available: S1(POS) and S3(STR). The default setting is
S1(POS)
. Generally,
ACPI has six states: System S0 state, S1, S2, S3, S4, S5. S1 and S3 states are described
below:
The S1 (POS) State (POS means Power On Suspend):
While the system is in the S1 sleeping state, its behavior is as described below:
!
The processor is not executing instructions. The processor’s complex context is
maintained.
!
Dynamic RAM context is maintained.
!
Power Resources are in a state compatible with the system S1 state. All Power Resources
that supply a System Level reference of S0 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 continue execution where it left off.
Содержание SE6
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