Ubuntu系统怎么设置开机屏幕亮度？
默认情况下，Ubuntu开机后会把屏幕亮度设为最高，这里介绍将其设为最低的方法
1、找到/sys/class/backlight/acpi_video0,里面有屏幕亮度的参数
http://img14.3lian.com/201503/27/de7bda1f51df1879a14f38de72f30c07.jpg 2、打开brightness,显示的数字即当前亮度参数
http://img14.3lian.com/201503/27/c4c0ed8c31b770d08eb2b631bf58d698.jpg 3、找到/etc/rc.local
http://img14.3lian.com/201503/27/29d3ee917c15283c7037cbc8f683ee43.jpg 4、内容如下
http://img14.3lian.com/201503/27/a27b48f3b654928b1bd66fd521e3a67f.jpg 5、打开终端，输入以下内容：sudo gedit /etc/rc.local
http://img14.3lian.com/201503/27/a9530d0c93d4f278d9b82a4d0df83269.jpg 6、输入密码打开后，在exit 0之前插入一行：echo 0 >/sys/class/backlight/acpi_video0/brightness
http://img14.3lian.com/201503/27/bf5a1cd5314b4663985a789a167e44ba.jpg
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