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On a fresh install of Ubuntu 11.04, running Unity, I can't adjust the brightness via Fn+Up/Down. The brightness panel will show, and increase/decrease accordingly, but the actual brightness never changes.

This is an issue I also had on 10.04. I used to fix this by adding this line

Option "RegistryDwords" "EnableBrightnessControl=1"

to my /etc/Xorg/xorg.conf in Section "Device". However it seems this is not working anymore. I also noticed the config file is much smaller that what I remember. Here is the whole file:

Section "Device"
Identifier      "Default Device"
    Option  "NoLogo"        "True"
    Option  "RegistryDwords"        "EnableBrightnessControl=1" 
EndSection

Should I use this line somewhere else ? or is there something else to fix ?

For reference, here is the original issue on 10.04: https://answers.launchpad.net/ubuntu/+source/xserver-xorg-video-nv/+question/109012

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  • Did you solve the problem? I've got the same on my 3500...
    – Mateusz
    Commented May 14, 2011 at 16:08
  • No, not solved. I'll post the answer if I find it.
    – PowerKiKi
    Commented May 15, 2011 at 11:06

2 Answers 2

Reset to default
4

i have same problem on dell vostro 3500 and solution from this question helped me to fix brightness bug: Screen brightness not changing on Acer 5742 notebook

The complete solution is:

  1. edit /etc/Xorg/xorg.conf to add the following line in Section "Device":

    Option "RegistryDwords" "EnableBrightnessControl=1"

  2. edit /etc/default/grub to change the line into:

    GRUB_CMDLINE_LINUX="acpi_osi=Linux"

  3. run the command:

    sudo update-grub

  4. reboot

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4
  • It worked for me, however I had to re-add the line in my xorg.conf as described in the OP. Thank to everybody involved in this answer ;-)
    – PowerKiKi
    Commented May 18, 2011 at 21:39
  • It's still working for Ubuntu 11.10
    – PowerKiKi
    Commented Nov 15, 2011 at 1:06
  • It also works for Ubuntu 12.04 (Dell Inspiron 17R 7720; used "acpi_osi=" instead though but still worked)
    – Patelify
    Commented Dec 27, 2012 at 4:12
  • Still working on 13.04 with one difference. There is no xorg.conf by default. To create one stop Xorg and run from root following commands: X -configure and then cp /root/xorg.conf.new /etc/X11/xorg.conf
    – Novarg
    Commented Jun 16, 2013 at 13:03
0

I believe you need to install Nvidia blacklight driver (nvidia-bl-dkms). The package itself has been developed for MacBooks, but they use same Nvidia model – G310M.

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