由于ubuntu的驱动问题，笔记本上的亮度调节快捷键基本上用不了，所以我写了个脚本来调节亮度，然后把脚本映射到自定义快捷键上
原理
控制亮度文件的文件在
/sys/class/backlight/intel_backlight/brightness里面
$ cd /sys/class/backlight/intel_backlight
$ ls
actual_brightness brightness max_brightness subsystem uevent
bl_power device power type
$ cat brightness
287
$ cat max_brightness
937
brightness里面保存的是当前亮度
max_brightness里面保存的是亮度最大值
所以直接修改brightness的值就可以调节亮度了
开始操作
首先修改brightness的权限
sudo chmod 777 /sys/class/backlight/intel_backlight/brightness
然后可以执行命令测试是否能调节亮度
调节亮度为100
echo 100 > /sys/class/backlight/intel_backlight/brightnes
调节亮度为0
echo 0 > /sys/class/backlight/intel_backlight/brightnes
如果成功了就可以开始写脚本了
亮度增加 ：brightness_up.sh
#password里面填你的密码
if [ ! -w /sys/class/backlight/intel_backlight/brightness ];then
echo "password" | sudo -S chmod 777 /sys/class/backlight/intel_backlight/brightness
fi
read bright < '/sys/class/backlight/intel_backlight/brightness'
v=0
v=$((30 + $bright))
if [ $v -gt 937 ]; then
v=937
# 937为我的最大亮度，即max_brightness文件里面的值
fi
echo $v > /sys/class/backlight/intel_backlight/brightness
亮度降低 ：brightness_down.sh
if [ ! -w /sys/class/backlight/intel_backlight/brightness ];then
echo "password" | sudo -S chmod 777 /sys/class/backlight/intel_backlight/brightness
fi
：
read bright < '/sys/class/backlight/intel_backlight/brightness'
v=0
v=$(($bright - 30 ))
echo $v > /sys/class/backlight/intel_backlight/brightness
后面的就比较简单了，直接在设置里面配置快捷键，然后把对应的命令写进去，比如ubuntu在设置-keyboard快捷键的command里面填
sh ..../brightness_up.sh
