查看当前亮度值和最大亮度值
cat /sys/class/backlight/intel_backlight/brightness
cat /sys/class/backlight/intel_backlight/max_brightness
设置当前亮度
cd /sys/class/backlight/intel_backlight
sudo sh -c 'echo 500 > brightness'
https://blog.csdn.net/sonicss/article/details/122338606