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erjiang
Asked: 2012-04-15 22:05:01 +0800 CST

Brightness keys adjust brightness too many times

  • 772

Every time I hit a brightness key on my laptop's keyboard, it adjusts the brightness by three steps instead of one. How can I fix it so that it only adjusts one step at a time?

I am using an Acer Aspire D250 with the newest firmware. It was working better when I was using Ubuntu 10.10 with older firmware (although the scale was off).

Any tips on debugging this would be appreciated.

Edit: My graphics:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)

/sys/class/backlight$ ls
acpi_video0  intel_backlight
ubuntu-netbook laptop brightness acer

3 Answers

  1. Best Answer

    I had a smiliar problem:

    I run Ubuntu 12.04 on my netbook (Acer Aspire One D255E) and I have the following problem with the brightness settings: If I want to adjust the brightness with the fn-key, I can only change between three brightness steps, but my netbook has nine brightness steps.

    Ruben Bakker gave this instructions, which solved the problem.

    Easy fix. In the terminal:

    gksudo gedit /etc/default/grub

    You will find this line in the new opened window:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

    Change it to:

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

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

    sudo update-grub

    Then reboot. Rejoice :)

    Link: Problem with brightness settings with Acer Aspire One D255E in 12.04

    • 3

  2. Put 'blacklist video' (without the quotes) in

    /etc/modprobe.d/blacklist.conf

    and reboot. Hopefully this should solve your problem.

    • 0 
  3. # rmmod video
# modprobe video brightness_switch_enabled=0
    • 0