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Aug 10, 2012    |       33 comments

[SOLVED] Brightness problem in Ubuntu 12.04 Precise Pangolin

Well my friends have been facing brightness problem in Ubuntu 12.04 Precise Pangolin. And every one were facing and asking me to help me out with it. So, I viewed all over the Internet and helped them out. I helped with it myself too in Dell XPS 13. And for friends Acer Aspire, HP Pavilion DV6. So it might work on most of all the PCs.

My friends were just trying the xrand solution that just decreases the Contrast which had no effect on the power consumption. So, this solution was the most to be kept. I am feeling quite when the Fn(Function key) and the Brightness Up and Down are working great. You can follow up the procedure that I have kept in an easy steps.

Open terminal ( Ctrl+Alt+T ) and type:

sudo gedit /etc/default/grub

You will find this line in the new opened window:

Change it to:

Save and close the window and type this in the terminal:

sudo update-grub

This will update your grub and while rebooting your PC, it will set an extra parameter on the grub menu during boot. This problem might have occur on due to the upgrade on kernel.

Enjoy the power saving system.

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  • JC00002

    Hi

    I tried the above changes to try and fix the brightness problem and it did not work. I have a Dell XPS L702X.

    Still the same problem of not being able to adjust the brightness even after implementing the changes.

  • harsha

    tried this on my vaio…nothing happened :(

    • http://www.techjail.net/ Techjailer

      Really? But my most of the friends are good with this but I couldn’t test on Vaio cause non have that one :(

  • Alex Smirnov

    It works with HP dv6-6b53er (i5 2430m + 6770m). Thank you.

  • Chris

    Thank You a lot! It works fine on a Toshiba Tecra M11 running Ubuntu 12.04 64bit. :)

  • Sitansh Rajput

    Thank you so much. Worked on my DV6TQE 6100 CTO. Although I have a system error reporting something along the lines of gnu_color?

    • http://www.techjail.net/ Techjailer

      I am not sure about that. Never faced that problem. Will try to replicate that problem. Try reporting on Ubuntu they will provide a simple Kernel Patch next time on the Synaptic updates.

  • sumbody

    THAAAAAANK YOOOU!
    it helped inna HP 450 as well
    i added acpi_osi=linux and the brightness n volume keys (those that works pressing Fn key) started working too

  • Quipman

    Thank you I tried your solution and it worked on my Toshiba L305-s5919 laptop.

  • DON

    TU

  • Ivan

    Not working on Toshiba L855.
    This setting even removed the backlight controller from the system settings, and I can’t do anything with function keys.
    Any ideas about what value I could use instead “vendor”?

  • http://twitter.com/FindMyBeer Find My Beer

    This solution worked great on my HP pavillion DV6 laptop running ubuntu 12.04. Thanks!

  • Sven Svensson

    After sudo update-grub, I get

    “/usr/sbin/grub-mkconfig: 11: /etc/default/grub: splash: not found”

    Any thoughts?

    • http://www.techjail.net/ Techjailer

      I am not quiet sure but why have you done grub update?
      in the Above post please note that the auto ” is somewhat changed so the error occurs. Please correct the “Quote” thing to the original quote.

  • Jordan V.S

    Thank you!!!!!!

    It helped me to solve a problem that I thought was insoluble

  • http://twitter.com/alexlopesnet Alex Lopes

    Works like a charm with my Notebook LG R580 and Ubuntu 12.10… THANK YOU!!! :D

  • Martin Wildam

    Oh, I THANK YOU SO MUCH!
    Indeed battery indicator also shows now much more time remaining – we will see if it keeps to promise. ;-)

  • me

    Thank you very very much!!!

  • Adolfo

    Thank you so much…it work for Lenovo Z360

  • Angel

    Thanks!! I’ve been trying to solve this problem and only this works on my Gateway M-Series.

  • SpoK DZ

    thanks :) work with acer aspire 5742

  • damystica

    3 words: Oh My Goodness!

    After all the stupid stupidest stupidier workarounds in rc.local and LMT, all it took was adding simple: quiet splash acpi_backlight=vendor to grub! From now on, any increase/decrease in brightness through user interaction is kept…NO MORE RE-ADJUSTING! Woohoo!

    You, my man, are a Ubuntu Savior! I believe this change will work on most laptops with Intel HD3000+

    Thank you and thanks God!

  • Ivan Huerta

    YES!!! Thank you so much!!! on my HP Pavilion dv6 (w/ Beats audio)

  • http://twitter.com/GniKrutuf Philippe

    This solved my problem in half. My brightness was just out of control and I could not control it at all and the computer was working really hard. Now I can control the brightness bar, the computer does not get crazy anymore, but the brightness does not change. It’s at the minimum.

    • http://www.techjail.net/ Techjailer

      Ok, that must have solved the problem. Wait for the latest update of kernel and hope for the best. If available, try updating with Kernel 3.9 if you want some fun.

  • Guest

    Can’t open “sudo gedit/etc/default/grub”.
    error: command not found
    please help

    • http://www.techjail.net/ Techjailer

      you forgot the “” the command looks as:
      sudo gedit /etc/default/grub
      you mistakely typed “gedit/etc/default/grub”

  • http://www.facebook.com/hardeep.singh.9809 Hardeep Singh

    not working on acer 5750.. plz help

    • http://www.techjail.net/ Techjailer

      What exactly does it shows or what exactly happens?

      • http://www.facebook.com/hardeep.singh.9809 Hardeep Singh

        I changed the line in grub. Updated it but still not working. i’m not getting an errors, it just not working.

        • http://www.techjail.net/ Techjailer

          What PC is yours actually?