如何通过终端命令控制背光

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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