Detailed analysis of Sleep Status in Linux

Does sleep in Linux provide sleep and sleep in a common windows system. In Linux sleep, there are two ways to sleep: mem and standby. Sleep also has two ways: shutdown and platform. Each method is somewhat different.
Before proceeding, check the methods supported by your internal nuclear energy:

# Cat/sys/power/state
Standby disk

Linux sleep: 1. sleep)

There may be two ways to sleep: mem and standby, both of which are suspend to RAM (STR for short), but standby consumes more power and returns to the normal working mode for a shorter time.

Only

# Echo standby>/sys/power/state

You can.

Linux sleep 2. hibernation)

There are two ways to sleep: shutdown and platform. Shutdown is a common method and is more reliable. If your system supports ACPI very well, you will have the opportunity to support the platform method. Activation methods are slightly different:

# Echo platform>/sys/power/disk; echo disk>/sys/power/state
Or
# Echo shutdown>/sys/power/disk; echo disk>/sys/power/state

Note that the premise of hibernation is to specify the resume device when the system starts, that is, the partition to be saved for the sleeping image. Generally, swap partitions are used.

The method is as follows:

Kernel/boot/vmlinuz root =/dev/sda1 resume =/dev/sda2 vga = 0x314...

In this way, when the system is started, the kernel will check the content in resume. If there is an image that has been sleeping last time, the kernel will read the image into the memory and resume normal operation.

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