英伟达 nvidia jetson AGX xavier 风扇开机自启动设置

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 Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no

在后面添加install区块：

[Install]
WantedBy=multi-user.target
Alias=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 Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no

[Install]
WantedBy=multi-user.target
Alias=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 30
echo "200" > /sys/devices/pwm-fan/target_pwm
 
 
exit 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：
https://blog.csdn.net/u013171226/article/details/107680325
http://lnmp.ailinux.net/systemctl