acpi in Linux is the abbreviation of "Advanced Configuration and Power Interface", which means advanced configuration and power management interface. This is an industrial standard jointly developed by Microsoft, Intel and Toshiba. ACPI provides all power management interfaces for operating systems and applications to manage, including various software and hardware specifications.
The operating environment of this tutorial: linux5.18.14 system, dell g3 computer.
What does linux acpi mean:
ACPI is the abbreviation of Advanced Configuration and Power Interface. Chinese means "Advanced Configuration and Power Interface", which is an industrial standard jointly developed by Microsoft, Intel and Toshiba.
The Advanced Configuration and Power Interface (Advanced Configuration and Power Interface) provides all power management interfaces for operating systems and applications to manage, including various software and hardware specifications.
The 3.0 specification was launched in 2004; the 4.0 specification was launched in 2009; and the 5.0 specification was launched in 2011. New ACPI specifications after 2013 will be developed by the UEFI Forum. Functions that ACPI can implement include: power management; performance management; configuration and plug-and-play; system events; temperature management; battery management; SMBus controller; embedded controller.
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ACPI can mainly realize the following functions:
Users can turn the computer on and off at specified times;
Plug and play devices can be controlled and powered by ACPI when plugged in;
can put the computer into sleep mode when no one is using it, but ensure that some communication devices are turned on.
The operating system can allocate power to peripherals and motherboards based on their specific needs.
The operating system can reduce the clock frequency when the application is not time critical.
Users of laptop computers can specify that the computer enters a low-power state when the voltage is low. to ensure the execution of important applications.
At the same time, ACPI can be divided into six different working states, each from S0 to S5. Their respective meanings are:
S0: The computer is normal Working, all hardware devices are on or working normally;
S1: also called POS (Power on Suspend, CPU stops working), other hardware devices still work normally;
S2: Shut down the CPU, but other hardware devices are still running;
S3: Usually called STR (Suspend to RAM. Suspend to RAM. play memory). Write the executing data into the memory and then turn off the hard disk;
S4: also known as STD (Suspend to Disk. Suspend to the hard disk). The memory information is written to the hard disk, and then all components stop working;
S5: All hardware devices (including power supplies) are turned off, that is, shut down.
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