(3) 重启，让配置生效
经过上面复杂的配置后，hibernation 休眠才能真正成功。与 suspend 休眠类似，我们也能使用 systemctl 来进行休眠
systemctl hibernate
类似的，它的实际动作由 systemd-hibernte.service 所定义, 在 archlinux 上，它长成这样子的:
| # SPDX-License-Identifier: LGPL-2.1+ # # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. [Unit] Description=Hibernate Documentation=man:systemd-suspend.service(8) DefaultDependencies=no Requires=sleep.target After=sleep.target [Service] Type=oneshot ExecStart=/usr/lib/systemd/systemd-sleep hibernate |
hybrid 休眠
在配置好 hibernate 休眠后，也就能正常进行 hybrid 休眠了，方法是执行
systemctl hybrid-sleep
类似的，它的实际动作由 systemd-hybrid-sleep.service 所定义, 在 archlinux 上，它长成这样子的:
| # SPDX-License-Identifier: LGPL-2.1+ # # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. [Unit] Description=Hybrid Suspend+Hibernate Documentation=man:systemd-suspend.service(8) DefaultDependencies=no Requires=sleep.target After=sleep.target [Service] Type=oneshot ExecStart=/usr/lib/systemd/systemd-sleep hybrid-sleep |
Sleep Hooks
从上面的service文件中可以看出，不管是哪种类型的系统休眠，其内部实际调用的都是 systemd-sleep.
man systemd-sleep
| SYSTEMD-SUSPEND.SERVICE(8) systemd-suspend.service SYSTEMD-SUSPEND.SERVICE(8) NAME systemd-suspend.service, systemd-hibernate.service, systemd-hybrid- sleep.service, systemd-sleep - System sleep state logic SYNOPSIS systemd-suspend.service systemd-hibernate.service systemd-hybrid-sleep.service /usr/lib/systemd/system-sleep DESCRIPTION systemd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend. Similarly, systemd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally, systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to execute hybrid hibernation with system suspend. Immediately before entering system suspend and/or hibernation systemd-suspend.service (and the other mentioned units, respectively) will run all executables in /usr/lib/systemd/system-sleep/ and pass two arguments to them. The first argument will be "pre", the second either "suspend", "hibernate", or "hybrid-sleep" depending on the chosen action. Immediately after leaving system suspend and/or hibernation the same executables are run, but the first argument is now "post". All executables in this directory are executed in parallel, and execution of the action is not continued until all executables have finished. Note that scripts or binaries dropped in /usr/lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If applications want to react to system suspend/hibernation and resume, they should rather use the Inhibitor interface[1]. Note that systemd-suspend.service, systemd-hibernate.service, and systemd-hybrid-sleep.service should never be executed directly. Instead, trigger system sleep states with a command such as "systemctl suspend" or similar. Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written where can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd- sleep.conf(5). OPTIONS systemd-sleep understands the following commands: -h, --help Print a short help text and exit. --version Print a short version string and exit. suspend, hibernate, hybrid-sleep Suspend, hibernate, or put the system to hybrid sleep. SEE ALSO systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8) NOTES 1. Inhibitor interface |
