Skip to main content

How to fix Ubuntu brightness problem






How to play with Ubuntu brightness



Fix the fixed brightness

If you have faced the problem of fixed brightness of ubuntu then you are at the right place because after searching so much, i have finally found the solutions. Yeah you are right, solutions..! There are so many causes to this problem thats why i have listed the possible solutions.You can try each and every solution and do a reboot after applying solution.

Solutions

  • Run this code in the terminal.xrandr --output LVDS1 --brightness 0.5 (It will not change the brightness but only the contrast. Also there is no need to reboot)

  • Editing Grub Configuration

    1. Run this commandsudo gedit /etc/default/grub. It will open the grub file.
    2. Change this code B_CMDLINE_LINUX_DEFAULT="quiet splash" to B_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
      3. OR (try the first one then second if first didn't work)
    3. Change this code B_CMDLINE_LINUX_DEFAULT="quiet splash" to B_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
    4. And if none of the above worked then try adding both the pieces.(believe me its this much varying)
    5. Then run update-grub. Now just reboot the system.
  • Now some more work. Go to the directory /sys/class/backlight.
    1. Check the interfaces there by running ls. There may be more than one like acpi_video0 OR intel_backlight. We'll perform the following steps for each interface and check the results.
    2. Go to your interface directory, for eg. intel_backlight.
    3. Run this command sudo echo 4 > brightness
      sudo echo 4 > max_brightness
      sudo echo 4 > actual_brightness
    4. Check if the brightness changes. If it does then you'll have to change it each time using this method only. And if it does not then repeat the procedure for other interfaces.
  • Newer kernel versions seem to have the problem so try to downgrade the kernel version to 3.12.

If it still not fixes the problem for you then get your laptop hardware checked or checking the graphics card properties. Although the second solution works for 80% of the people.


Labels:

Comments

Post a Comment

Comment on articles for more info.

Popular posts from this blog

Cordova viewport problem solved

Include the viewport settings in Cordova If you are facing the auto zooming problem of cordova then go read on the full article. Cordova actually ignores the viewport meta tag which causes the pixel density problem. So we need to tell cordova that viewport tag is equally important as other tags. To do this, we need to add some code to a file which is specify in the article. Corodva messes with pixels If you are using the latest cordova version or creating the cordova app for latest android versions then you may have faced the zoom malfunctioning.I also faced it when creating an app. Many of you may have already searched the web and found the answer of changing the meta tag attributes to get it working. But adding target-densitydpi=medium-dpi does not solve the problem for latest android versions. It may work for gingerbread but not for kitkat and others. So the final solution which i found was one of the stackexchange answer but rarely found. So i am gonna two things here, i ...
5 comments
Read more

Image Search Engine Using Python

Images provide a lot more information than audio or text. Image processing is the prime field of research for robotics as well as search engines. In this article we will explore the concept of finding similarity between digital images using python. Then we will use our program to find top 10 search results inside a dataset of images for a given picture. It won't be as good as google's search engine because of the technique we will be using to find similarity between images. But what we are going to make will be pretty cool. So lets start. Setting up the Environment Our Algorithm How the code looks Lets build the GUI Additional Techniques Setting up the Environment The code we are going to write requires a few tools which we need to install first. I will try to be as precise as i can and if you get stuck into installing some tool then you can drop a comment below and i will help you sort out the problem. So here are the tools and the steps to install ...
18 comments
Read more

Authentication System : Basic Design

Being a system administrator, it is our main concern to protect users' data from theft and corruption. Regarding theft, we focus in building a sophisticated but secure authentication system which can fulfill all the basic needs we discussed in the last article . In the previous 2 articles, we learned about authentication and authorization. Also we understood the complications in building a secure system which can prevent tresspassing. But we have not code anything yet to build something. So in this article we will be designing an authentication system which will provide the functionalities we want and which will help us understand how the tech giants like google have taken security to another level. We will be writing code in php but the same applies to other languages also. What we'll be using Blueprint Building the system Running the system Additional Care What we'll be using Lets see what are the languages we will be using and database plus som...
Post a Comment
Read more