Ubuntu 14 保存屏幕亮度解决方法

Ubuntu 14 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100

kashu@ubuntu:~$ cat /sys/class/backlight/acpi_video0/max_brightness

100

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 100 > /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 100 > /sys/class/backlight/acpi_video0/brightness

exit 0

其中echo 后面的值为0-100，对应为0到100%,如echo 50表示一半亮度

3、保存后退出，重启就可以了