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Thread: Laptop brightness controls aren't working

  1. #1
    Join Date
    Mar 2014

    Laptop brightness controls aren't working

    Hey, so it's my first day using ubuntu!!! All of my drivers worked with no problem. The only problem is my brightness controls. When i use my fn keys to change my brightness, a scale comes up from ubuntu but the screen stays the same. I'm using a dell latitude 3450.

  2. #2
    Join Date
    Mar 2010
    Ubuntu 12.04 Precise Pangolin

    Re: Laptop brightness controls aren't working

    Welcome to the forums Jason!

    To let us see your video brightness settings, please show us some command outputs. Please open a terminal (Ctrl-Alt-T) and run the following codes in it one-by-one (you may copy-paste it using your mouse cursor) -
    uname -mr
    lsmod | egrep 'wmi|acpi'
    cat /proc/cmdline
    for i in /sys/class/backlight/*; do echo -e "\n $i"; cat $i/{brightness,max_brightness,actual_brightness}; done
    Copy-paste the outputs in your next post here.

    While posting the outputs, please use 'Code' tags. It preserves the output's formatting and makes the post cleaner, compact and more readable. To see a quick 'HowTo' with screenshots, please follow the "Using Code Tags" link in my signature.
    Help others by marking threads as [SOLVED], if they are. (See how)
    Wireless Script | Use Code Tags

  3. #3
    Join Date
    Mar 2014

    Re: Laptop brightness controls aren't working

    The op might not understand how to copy and paste to and from terminal and/or how to post the results here on the forum. I'm a newbie too, and had the same issue. Fortunately for me, I had a mentor next door who helped me immensely.

    In Windows, the Dell specific driver called 'Dell Quickset' allows the Fn keys to function. The is no similar utility program for Ubuntu, so your Fn keys can't work.

    All the functions can be duplicated with command line controls however.

    And, my Fn keys in my Dell laptop do function after installing the latest Daily Build of 14.04. The developers have improved the new version of Ubuntu by providing proper support for the Fn keys on Dell Systems.

    I can't reccomend changing to 14.04 as it's rumored to be unstable and is only a Beta version. But, when 14.04 is released in April, you will likely want to use it.



    PS:There is also a utility program that allows the screen brightness to function, but it is a stand alone program, it does not use the Fn keys to control the screen brightness directly.

    Last edited by artie3; March 5th, 2014 at 05:13 PM. Reason: typo correction

  4. #4
    Join Date
    Nov 2010

    Re: Laptop brightness controls aren't working

    have you gone through xbacklight ?
    Dont miss anything even it is small. one small pin is enough to bring down a man.


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