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Mike Wentworth
Asked: 2013-10-02 17:27:56 +0800 CST

Brightness Not Responsive [duplicate]

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In Ubuntu 13.04, whenever I decrease brightness, it still stays at its highest, and won't decrease. What's the fix?

Info

13.04, using Gnome Environment, but its Ubuntu 13.04. Dell Inspiron

Also, cannot get updates at ALL

"Failed to get repository information." Sudo apt-get update also gives errors at end.

13.04

2 Answers

  1. Edit the grub configuration:

    $gksu gedit /etc/default/grub

    add: 

    GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

    after:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    then update the grub and restart:

    $update-grub && reboot
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  2. I faced the same problem and did the following to resolve the issue. Firstly, do this...

    1. Open up the Terminal and type sudo gedit /etc/rc.local

    2. Then add this line before exit 0

      echo 980 > /sys/class/backlight/intel_backlight/brightness

    3. Now save the file. You can adjust value as you wish.

    The above steps will hold the brightness on reboots. Next, see this answer given to my question regarding the same issue Brightness Controls Not Working on a Dell Inspiron N4010 Laptop.

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