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I installed Ubuntu 14.04 LTS last week on my HP Pavillion DV6700 notebook. It was working perfectly until last night when I turned on the notebook and noticed the screen brightness was set to the minimun and two warnings of "application error" appeared on the screen. My fn+f7 and fn+f8 shortcuts to raise or lower the screen brightness are not working anymore.

Input:

    ls /sys/class/backlight

Output

    acpi_video0

I also ran the acpi_listen command and then pressed my key shortcuts to raise or lower the screen brightness but no output was printed.

When I looked with nano at the grub file at

    /etc/default/

It showed:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

I already tried modifying it to "quiet splash video.use_native_backlight=1" but it does not work. I also tried changing it to "quiet splash acpi_backlight=vendor" and it still does not work.

Any help would be aprecciated. Thank you!

Luís Muniz
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1 Answers1

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You can use this software to control brightness. However, it does not dim backlight, but will soothe your eyes. Install Brightness Controller with the following commands:

sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt-get update
sudo apt-get install brightness-controller

You can control brightness using its slider.


(source: ubuntu.com)

Glorfindel
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Archisman Panigrahi
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  • Thank you for your answer! However, I'm able to adjust screen brightness through ubuntu configurations. But I want to recover adjustment through the keyboard and stop with these errors that pop up at the beginning of a session. – Luís Muniz May 09 '16 at 13:30
  • @LuísMuniz You may try these http://askubuntu.com/a/510628/124466, http://askubuntu.com/a/135228/124466, http://askubuntu.com/q/94515/124466. – Archisman Panigrahi May 11 '16 at 05:59
  • @LuísMuniz Another tip: My HP laptop had these problems in Ubuntu 14.04, but they were all solved after installing Ubuntu 16.04 – Archisman Panigrahi May 11 '16 at 06:00