What is the standby power state?

The standby power state is a sleep state. Commonly used sleep methods are: 1. freeze, freezing I/O devices and placing them in a low-power state; 2. standby, in addition to freezing I/O devices In addition, the system will be paused; 3. mem, save the running status data to the memory, turn off the peripherals, and enter the waiting mode; 4. disk, save the running status data to the hard disk, and then shut down, which is the slowest to wake up.

#The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

What is the standby power status?

Power management-4 sleep mode states

# cat /sys/power/state
          //来得到内核支持哪几种休眠方式.

Commonly used sleep modes include freeze, standby, mem, disk

• freeze: Freeze I/O devices and put them in a low-power state, causing the processor to enter an idle state, wake up the fastest, and consume more power than other standby, mem, and disk methods

• standby : In addition to freezing I/O devices, it will also suspend the system, wake up quickly, and consume more power than other mem, disk methods

• mem: Save running status data to memory, and Turn off the peripherals and enter the waiting mode. The wake-up is slow and the power consumption is higher than the disk method.

• disk: Save the running status data to the hard disk, then shut down the computer and wake up the slowest

Example:

# echo standby > /sys/power/state
                   // 命令系统进入standby休眠.

Extension:

standby is the standby button. Many speakers are equipped with this button. After the power is plugged in, it does not power on immediately, but in the standby state. Press the standby button again to turn on the power and start working. It is a more user-friendly button.

Button is a commonly used control electrical component. It is often used to turn on or off the "control circuit" (in which the current is very small), so as to control the operation of motors or other electrical equipment.

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