针对 ubuntu 13.04 设置屏幕亮度无法保存问题的解决方案

装过 Ubuntu 的童鞋可能都遇到过这种问题，设置好合适的屏幕亮度关机重新启动后屏幕亮度又变为最大值。

针对这种情况，我上网找了一些资料，经过个人的尝试后问题得到解决！稍微整理了一下分享给大家：

1、首先我们打开这个文件 sudo gedit /etc/rc.local  内容如下

#!/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

2、我们在exit 0前面插入一段脚本

echo 5 > /sys/class/backlight/acpi_video0/brightness 内容变为

#!/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 5 > /sys/class/backlight/acpi_video0/brightness
exit 0

3、重启即可

注意：

在此处需要注意一下上面红字描述的部分，部分笔记本电脑可能不一样，需要自己查看一下。如果不一样，替换成你的文件名即可。

cd /sys/class/backlight/

ls
acpi_video0  radeon_bl0

echo 5 > /sys/class/backlight/acpi_video0/brightness 中的数字5代表屏幕亮度系数，5代表50%亮度！改成自己需要的数值即可。