记录2--ubuntu保存默认的亮度

亮度保存: 

sudo vi /etc/rc.local

打开后内容：

#!/bin/sh -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.exit 0

插入这句话到exit 0的前面：

echo 20 > /sys/class/backlight/acpi_video0/brightness