# 查看最大亮度的数值是多少，显卡不同，/sys/class/backlight文件夹下的布局也不同，需要根据自己的情况进入不同的目录
$ cat /sys/class/backlight/intel_backlight/max_brightness
# 修改文件权限
$ sudo chmod 766 /sys/class/backlight/intel_backlight/brightness
# 修改亮度值
$ sudo echo 300 > /sys/class/backlight/intel_backlight/brightness
可以创建light.sh脚本至桌面上双击改变亮度
#!/bin/bash
sudo chmod 766 /sys/class/backlight/intel_backlight/brightness
echo 700 > /sys/class/backlight/intel_backlight/brightness
