What is ACPI sleep state?

What is ACPI sleep state?

S3 (Suspend to Ram): The S3 sleeping state is a low wake latency sleeping state. This state is similar to the S1 sleeping state except that the CPU and system cache context is lost (the OS is responsible for maintaining the caches and CPU context).

What is ACPI in Linux?

ACPI, known as a Hardware Abstraction Layer (HAL) in embedded computing, is an abstraction layer between the operating system, platform firmware and hardware. This allows the OS and the platform to evolve independently. ACPICA includes an ACPI Machine Language (AML) interpreter that is resident in the Linux kernel.

How do I put Linux in sleep mode?

You can use the following commands under Linux to suspend or Hibernate Linux system:

1. systemctl suspend Command – Use systemd to suspend/hibernate from command line on Linux.
2. pm-suspend Command – During suspend most devices are shutdown, and system state is saved in RAM.

What is Linux hibernation?

In the Hibernate mode, the computer shuts down the computer entirely, and hence so there will be no power consumption whatsoever when the PC is in the Hibernation state. When you put the computer to Hibernate, the session content from the RAM is moved to hard disk swap space, and after that, the system is powered off.

What does ACPI?

ACPI is an acronym that stands for Advanced Configuration and Power Interface, a power management specification developed by Intel, Microsoft, and Toshiba. ACPI is designed to allow the operating system to control the amount of power provided to each device or peripheral attached to the computer system.

Does Linux have sleep mode?

Sleep mode (aka Suspend, Standby), puts your computer to a low power mode. The monitor is turned off, and RAM (memory) chip gets minimal power to sustain its data. It saves RAM (memory) content to disk, and powers down spinning hard disk. However, hibernation takes longer time to wake up.

Is suspend like sleep?

When you suspend the computer, you send it to sleep. All of your applications and documents remain open, but the screen and other parts of the computer switch off to save power.

Which is the system sleep state on ACPI?

On ACPI-based systems this state is mapped to the S1 system state defined by ACPI. This state (also referred to as STR or S2RAM), if supported, offers significant energy savings as everything in the system is put into a low-power state, except for memory, which should be placed into the self-refresh mode to retain its contents.

Why does my ACPI put my computer to sleep?

To conserve energy while remaining quickly available, ACPI-compatible PCs may enter system sleep states. The ACPI specification defines 5 of these states, known as S-states.

Where to find the ACPI documentation in Linux?

Linux/ACPI. Documentation: The file /sys/power/state || /proc/acpi/sleep. Warning: /proc/acpi is being replaced by interfaces in /sys and new software should not look in /proc. To conserve energy while remaining quickly available, ACPI-compatible PCs may enter system sleep states. The ACPI specification defines 5 of these states, known as S-states.

How many sleep states does the Linux kernel support?

Depending on its configuration and the capabilities of the platform it runs on, the Linux kernel can support up to four system sleep states, includig hibernation and up to three variants of system suspend. The sleep states that can be supported by the kernel are listed below.