ubuntu 12.04保存屏幕亮度解决方法

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Ubuntu 12.04 LTS不能自动保存亮度：每次登陆、解锁后，都是最大亮度，非常讨厌！
1、打开终端，输入命令查看本机支持的最大亮度值
cat /sys/class/backlight/acpi_video0/max_brightness

我的笔记本支持最大亮度为20
kashu@ubuntu:~$ cat /sys/class/backlight/acpi_video0/max_brightness
20

2、编辑这个文件
sudo gedit /etc/rc.local
打开后你会看到如下内容：

#!/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

插入这句话到代码中：

echo 16 > /sys/class/backlight/acpi_video0/brightness

就像我下面的一样：
kashu@ubuntu:~$ cat /etc/rc.local

#!/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.echo 15 > /sys/class/backlight/acpi_video0/brightnessexit 0

其中echo 后面的值为0-20，对应为0到100%,如echo 10表示一半亮度

转载自：http://linzhibin824.blog.163.com/blog/static/7355771020133532038651/

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