Legacy

System PM http://www.wowotech.net/pm_subsystem/suspend_and_resume.html Linux 内核提供了三种 Suspend: Freeze、Standby 和 STR(Suspend to RAM)，在用户空间向”/sys/power/state”文件分别写入”freeze”、”standby”和”mem”，即可触发它们。 echo "freeze" > /sys/power/state echo "standby" > /sys/power/state echo "mem" > /sys/power/state 参考文章： https://www.cnblogs.com/arnoldlu/p/6253665.html 系统睡眠模型 On S0 - working Standby S1 - CPU and RAM are powered but not executed Suspend to RAM S3 - RAM is powered and the running content is saved to RAM Suspend to Disk , Hibernation(disk) S4 - All content is saved to Disk and power down 嵌入式系统中一般没有 Runtime 电源管理模型...