1、ctrl+alt+T打开终端输入下面的指令sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
2、再输入下面的指令：sudo gedit/usr/share/X11/xorg.conf.d/20-intel.conf
3、在跳出的gedit文件编辑器中输出以下命令：Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection保存，重启。你会发现调节亮度可以用啦！