如何通过终端命令控制背光 [英] How to control backlight by terminal command

问题描述

我试图制作一个控制Linux OS亮度的程序，但是我需要知道如何仅使用终端命令来控制显示器的背光? 我需要能够增加，减少.如果可能的话，还可以将屏幕变暗(并返回undo dim).

I am try to make a program that control the bright of Linux OS, but I need to know how to control the monitor backlight just using terminal commands? I need to be able to increase, decrease. And also dim screen (and return undo dim) if it is possible too.

推荐答案

有很多可能性.仅举几例:

There are many possibilities. Just to name a few:

1. 裸露回声

echo 8 > /sys/class/backlight/intel_backlight/brightness

查看/sys/class/backlight/intel_backlight/brightness/max_brightness以查看支持的最大亮度.

Look at /sys/class/backlight/intel_backlight/brightness/max_brightness to see what maximum brightness is supported.

2. 最简单的使用

安装xbacklight软件包，然后尝试

 xbacklight -inc 20     # increase backlight by 20%
 xbacklight -dec 30     # decrease by 30%
 xbacklight -set 80     # set to 80% of max value
 xbacklight -get        # get the current level

3.过于复杂

运行xrandr --verbose并查找分辨率如LVDS1 connected 1024x600+0+0的行.在此需要您的显示器名称(在此示例中为LVDS1).现在您可以设置亮度

Run xrandr --verbose and look for a line with resolution like LVDS1 connected 1024x600+0+0. The name of your display (LVDS1 in this example) is needed here. Now you are ready to set brightness

xrandr --output LVDS1 --brightness 0.4

但这仅设置软件，不设置硬件亮度，因此您可以超出限制(在两个方向上).不要指望美丽的结果，但是如果您足够勇敢尝试一下，那就系好安全带并跑动

But this sets only software, not hardware brightness so you can exceed the limits (in both directons). Don't expect beautiful results but if you are brave enough to experiment a little bit then fasten your seatbelt and run

xrandr --output LVDS1 --brightness 1.7
xrandr --output LVDS1 --brightness -0.4  #yes, negative value is possible
xrandr --output LVDS1 --brightness 1

您可以使用xrandr折磨更多的显示器，但是如果出现问题，请准备重新启动计算机.例如，玩以下游戏

You can torture more your display with xrandr, but be ready to reboot your computer if something goes wrong. For example play with the following

xrandr --output LVDS1 --reflect x
xrandr --output LVDS1 --reflect xy
xrandr --output LVDS1 --reflect normal     # return to normal state
xrandr --output LVDS1 --rotate left
xrandr --output LVDS1 --rotate inverted
xrandr --output LVDS1 --rotate normal      # again, back to normal

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