![]() Get the current backlight brightness in percent Light is available in many GNU/Linux distributions already. See the following sections for the detailed descriptions of all available commands, options and how to access different controllers. Extra features, like setting a minimum brightness value for controllers, or saving/restoring the value for poweroffs/boots.Provides functionality to automatically control backlights with the highest precision available.Works even in a fully CLI-environment, i.e.Works where other software has proven unreliable (xbacklight etc.).Light is a program to control backlights and other lights under GNU/Linux: There is NO warranty not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE This is free software, see the source for copying conditions. Light - A program to control backlights (and other hardware lights) in GNU/LinuxĬontributor & Maintainer: Joachim Nilsson View the Project on GitHub haikarainen/light GNU/Linux application to control backlights On the other hand, I do not recommend chmod 777, but simply run the script as root or as sudoer.Įcho «You must pass at least one parameter (- or + i possibly the number by which the brightness increases or decreases. ![]() I can think of a medium script in a hurry that does both (raise or lower the brightness depending on a parameter) ![]() Please, could you correct me, I am doing wrong, it is something very important, since I cannot work in linux like that, it destroys my eyesight. Well with all this, I can not lower the brightness to leave it by default. Indeed, the brigtness file range is between. Then I have created the script «LowerBrightness.sh», and I have given the execution permission, and I have hosted it in /home/user/BajarBrillo.sh and its content is like what you put in the post:īrightness = $ (expr $ brightness - 3500) What I want to do is that from rc.local I execute a script at the end of the boot so that it modifies the value of brightness in a default value, and that leaves it fixed forever. How about friend, I give you my congratulations and thank you for giving light on this issue, which is affecting me a lot, since I always start my linux mint 13 matte, with the maximum brightness. YOUR BRIGHTNESS SHOULD ALREADY CHANGE PERFECTLYĪnd this is it, I hope this guide will help someone. Now we can run the scripts to raise and lower the brightness without any restrictions.īut of course, you are not going to start running scripts every time you want to raise or lower the brightness, so I recommend that you configure keyboard shortcuts to be able to change the brightness quickly. Once open, we add the following line just before the exit0 line:Ĭhmod 777 / sys / class / backlight / intel_backlight / brightness To do this we open the /etc/rc.local file with root or sudo permissions Now we are going to give permissions to the brightness file so that the scripts can modify its value. Once we have the scripts, we give them execution permissions:Ĭhmod + x Brightness Down.sh Brightness Up.sh ** Remember to change both the value to add or subtract and the file address to your proper file. Once we have identified the file that modifies the brightness, we are going to create two scripts, one to increase the brightness and the other to lower it:īrightness = $ (cat / sys / class / backlight / intel_backlight / brightness)Įcho $ brightness> / sys / class / backlight / intel_backlight / brightness One of the two or the ones you have should change the brightness of your screen. If modifying that file does not modify the brightness, we try the other one:Įcho 50> / sys / class / backlight / acpi_video0 / brightness I recommend putting half of the maximum value.Įcho 2500> / sys / class / backlight / intel_backlight / brightness Now we check which of the two files is the one that modifies the brightness:įor this, in a terminal with root permissions or using sudo:Īttention! We are going to modify the brightness value, so do not put 0, because you will not see anything. My intel_backlight values are from 0 to 4882 Max_brightness: Indicates the maximum value that the brightness can have sys / class / backlight / intel_backlight / brightnessīrightness: Indicates the current value of brightness sys / class / backlight / intel_backlight / max_brightness sys / class / backlight / acpi_video0 / max_brightness sys / class / backlight / acpi_video0 / brightness Within each of them there are several files, but the ones that interest us is brightness and max_brightness Here several folders will appear (they are really symbolic links), in my case 2: We open a terminal and write the following: Hello colleagues, yesterday I installed Kubuntu 13.04 on my laptop and the brightness did not work for me, like other distributions with kernel higher than 3.5.Īs always, I searched the internet for a solution, but none of them worked, although they did give me an idea of what the solution would be.
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