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Avoid changing brightness in Ubuntu

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<p><strong>In both Ubuntu 14.04 and 14.10 portable users will have noticed that the brightness level is not saved once we turn off the computer</strong> and every time we turn it on again it is set to a very low or very high value. Today in Root we will give you the key, whether your system reconfigures the brightness to the maximum or if it does so to the minimum.</p><div class=

Basically What we are going to do is that a certain level of brightness is automatically placed at each system startup.

  1. The first thing we need to do is find out which ACPI interface deals with the brightness of your system. We can do this easily with the Xorg registration, like this:

    grep acpi_video /var/log/Xorg.0.log

    Once the on-screen command has been executed We will have something similar to this:

    (7.385) (-) intel (0): Found backlight control interface acpi_videoX (type 'firmware') for output LVDS1

    The value acpi_videoX be either acpi_video0 or acpi_video1, Remember this value for the following steps.

  2. Now use the keys on your laptop to set the brightness to adjust the brightness to the level you want to be used as of now.

  3. After this let's find out the current brightness value As far as numerical value is concerned, we will use this command:

    cat / sys / class / backlight / acpi_videoX / brightness

    Remember the value for the next step.

  4. In this step we will create a file called fixbrightness.conf in the Ubuntu home directory, with this command:

    gksu gedit /etc/init/fixbrightness.conf

    And inside we will put this content:

    description "Sets brightness after graphics device is loaded"

    start on graphics-device-added


    exec / bin / echo BRIGHTNESS VALUE> / sys / class / backlight / acpi_videoX / brightness

    Remember that you should place the brightness value of step 3 and replace acpi_videoX for the value that corresponds to you. Save the file later.

  5. Restart your computer and the brightness adjustment be to your liking.

As we see the way to solve this problem is very simple, personally it is a small bug that I consider very uncomfortable and also very annoying for the user experience that Ubuntu gives us. We have seen that with just a few minutes to be solved and we can continue enjoying the linux world.

. (tagsToTranslate) Brightness (t) Ubuntu (t) Xorg

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