Linux 下使用rtcwake实现定时休眠和唤醒设备

2023-10-25 10:06| 来源: 网络整理| 查看: 265

查看是否安装rtcwake

whereis rtcwake rtcwake: /usr/sbin/rtcwake /usr/share/man/man8/rtcwake.8.gz

查看rtcwake帮助

rtcwake --help Usage: rtcwake [options] Options: -d, --device select rtc device (rtc0|rtc1|...) -n, --dry-run does everything, but suspend -l, --local RTC uses local timezone -m, --mode standby|mem|... sleep mode -s, --seconds seconds to sleep -t, --time time to wake -u, --utc RTC uses UTC -v, --verbose verbose messages -h, --help display this help and exit -V, --version output version information and exit For more details see rtcwake(8).

使用方法

standby

普通待机模式，为默认选项，对应ACPI state S1

mem

待机到内存，即内存之外把其他设备都进入低功耗模式，对应ACPI state S3

disk

待机到硬盘，即休眠，把电脑的当前状态保存到硬盘，几乎不消耗外部电源，对应ACPI state S4

off

通过调用系统的关机命令来休眠，对应ACPI state S5

可以通过以下命令查阅当前系统支持的休眠模式

cat /sys/power/state standby mem disk

执行该命令的时候需要root权限

1. 系统休眠后20seconds唤醒，加-v选项可以看到更多的打印信息

sudo rtcwake -v -s 20 -m mem 或 sudo rtcwake -v -s 20 -m standby

打印信息:

rtcwake -v -s 20 -m mem Using UTC time. delta = 0 tzone = 0 tzname = UTC systime = 1393296617, (UTC) Tue Feb 25 02:50:17 2014 rtctime = 1393296617, (UTC) Tue Feb 25 02:50:17 2014 alarm 0, sys_time 1393296617, rtc_time 1393296617, seconds 20 rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Feb 25 02:50:38 2014 suspend mode: mem; suspending system

2. 系统在指定的时间醒来

rtcwake -v -t `date -d 10:53 +%s` -m mem Using UTC time. delta = 0 tzone = 0 tzname = UTC systime = 1393296754, (UTC) Tue Feb 25 02:52:34 2014 rtctime = 1393296754, (UTC) Tue Feb 25 02:52:34 2014 alarm 1393296780, sys_time 1393296754, rtc_time 1393296754, seconds 0 rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Feb 25 02:53:00 2014 suspend mode: mem; suspending system rtcwake -v -t `date -d 10:54 +%s` -m standby Using UTC time. delta = 0 tzone = 0 tzname = UTC systime = 1393296794, (UTC) Tue Feb 25 02:53:14 2014 rtctime = 1393296794, (UTC) Tue Feb 25 02:53:14 2014 alarm 1393296840, sys_time 1393296794, rtc_time 1393296794, seconds 0 rtcwake: wakeup from "standby" using /dev/rtc0 at Tue Feb 25 02:54:00 2014 suspend mode: standby; suspending system

如果发现systime 和rtctime时间不一致，需要利用hwclock进行调整。

原文链接：https://blog.csdn.net/bulreed/article/details/19907691

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