Suspend to RAM command:
$ echo mem > /sys/power/state
or
$ echo mem > /proc/acpi/sleep
$ echo cmd > /sys/power/state
S1, "standby" 很低的延迟就能回到工作状态
S3, "mem", suspend-to-RAM, STR
S4, "disk" suspend-to-disk, STD,Hibernation
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