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Hello everyone, today we will talk about ACPI advanced power management

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ACPI is an advanced configuration and power management port

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It is a power management standard developed by Intel, Microsoft and Toshiba

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Its function is to control the system into a low-power sleep state,

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the purpose is to control the power consumption of the computer

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The ACPI controller is integrated inside the chipset

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There are two common states: a G state and an S state

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When the computer is in normal operation state, it is called S0 state, also called full on state

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When the computer is not running any programs,

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and after a few minutes, the brightness of the screen decreases,

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we call this the CPU idle state, which is the S1 or S2 state

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If the CPU is idle, the screen brightness goes dark

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If we still haven't run any programs, after a few minutes,

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the system will enter S3 state, which is sleep state

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In this state, only memory power and standby power are retained, and the screen brightness is black out

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In the S3 state, if we want it to wake up,

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we just need to move the keyboard or mouse, the screen will light up,

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and we can instantly return to the running state

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If the system enters S3 state, we still do not have any operation,

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after a period of time, the system will enter the sleep state

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The S5 state refers to the soft shutdown state,

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that is, the shutdown is clicked on the windows operation system

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After the system is shut down, we do not pull out the adapter, do not pull out the big battery,

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the standby part of the computer power supply still exists,

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waiting for boot at any time, this is called soft shutdown state

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In the S5 state, both deep sleep standby power and light sleep standby power are available

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If it is in battery mode, after the shutdown,

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in order to extend the battery life,

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the general shutdown will enter a deep sleep state

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In the deep sleep state, only the standby power supply in the deep sleep state is retained

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to reduce the power consumption in the standby state as much as possible and extend the battery life

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If we remove the big battery and the adapter,

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all that's left on the mainboard is the button battery

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At this time, only the RTC circuit of the mainboard is working

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This state is called the physical shutdown state, or G3 state

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The signals that control the system entering and exiting these states are called Sleep signals

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In the S0 state, these sleep control signals are all invalid and all are high

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When SLP_S3# is low,

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the system will be controlled to enter S3 state,

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and other signals are still high

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When SLP_S3# and SLP_S4# are both low,

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the system will be controlled to enter S4 state

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When SLP_S5# is low,

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the system will be controlled to enter the soft shutdown state

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In deep sleep, all of these SLP_S*# signals are low

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Ok, this is ACPI Advanced Power Management