1. 风扇开机自启设置
切换到 root 用户
sudo su
修改风扇pwm调速文件权限
chmod 777 /sys/devices/pwm-fan/target_pwm
修改系统外设配置文件，并添加风扇开机启动任务：
vim /lib/systemd/system/rc-local.service
注意：
1.如不知道该文件路径，可以通过搜索rc-local.service来查看；
2.vim编辑器使用：进入vim编辑器后，按i键进入编辑模式，对内容进行编辑，按esc退出编辑模式，退出编辑模式情况下，输入：wq，可保存并退出vim编辑器。
修改前内容：
# 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.# This unit gets pulled automatically into multi-user.target by# systemd-rc-local-generator if /etc/rc.local is executable.[Unit]Description=/etc/rc.local CompatibilityDocumentation=man:systemd-rc-local-generator(8)ConditionFileIsExecutable=/etc/rc.localAfter=network.target[Service]Type=forkingExecStart=/etc/rc.local startTimeoutSec=0RemainAfterExit=yesGuessMainPID=no
在后面添加install区块：
[Install]WantedBy=multi-user.targetAlias=rc-local.service
修改后内容：
# 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.# This unit gets pulled automatically into multi-user.target by# systemd-rc-local-generator if /etc/rc.local is executable.[Unit]Description=/etc/rc.local CompatibilityDocumentation=man:systemd-rc-local-generator(8)ConditionFileIsExecutable=/etc/rc.localAfter=network.target[Service]Type=forkingExecStart=/etc/rc.local startTimeoutSec=0RemainAfterExit=yesGuessMainPID=no[Install]WantedBy=multi-user.targetAlias=rc-local.service
新建任务文件：
vim /etc/rc.local
添加风扇自启任务（其中echo后的值为风扇转速，范围为0-250）：
#!/bin/bash -e## rc.local## This script is executed at the end of each multiuser runlevel.# Make sure that the script will "exit 0" on success or any other# value on error.## In order to enable or disable this script just change the execution# bits.## By default this script does nothing.sleep 30echo "200" > /sys/devices/pwm-fan/target_pwmexit 0
使rc-local服务自动启动
systemctl enable rc-local #这条语句就是创建一个超链接，在系统启动服务程序中.
给rc.local文件赋予可执行权限:
chmod +x /etc/rc.local
先执行如下命令,启动服务并检查状态
systemctl daemon-reload#重新加载systemctl stop rc-local.service#停止rc-local.service服务systemctl start rc-local.service#启动rc-local.service服务systemctl status rc-local.service#检查服务状态
如果上面的命令不报错了,那说明设置成功了,然后就可以重启看下效果
2. 直接开启风扇（重启无效）
用vim编辑器修改（范围：0~250）：
vim /sys/devices/pwm-fan/target_pwm
终端直接修改：
sudo sh -c "echo 150 > /sys/devices/pwm-fan/target_pwm"
第一次写博客，有不足之处请批评指出。
参考资料：
/u013171226/article/details/107680325
/systemctl
