I feel almost stupid asking a brightness question with all the similar ones out there, but I haven't yet found a working solution, so here goes:


HP dv3500 series laptop (dv3550eo - Scandinavian version) with a GeForce 9300M GS graphics card, drivers version 280.13 running on Ubuntu 11.10.

The system keys for changing brightness are Fn+F7 and Fn+F8, respectively, but nothing happens - I can't change the brightness.

A few of the tricks I've tried:

I'm guessing it's a driver problem, but I've already installed the nvidia drivers (there was a popup upon first restart after install).

I apologize in advance for not reiterating the rest of the suggested fixes I've tried, as they are too numerous for me to remember, and have frankly left me exhausted.

I hope a user with a similar computer to mine has found a fix, elsewise I fear this shall be the fourth time over the years I've given Linux a crack only to give it up again within a fortnight :-/

Fingers crossed for a solution.

2 Answers 2


Please try smartdimmer. I've succeeded using it via command line, now looking a way to bind it to fn+f7 and fn+f8.


Open /etc/default/grub with your favorite text editor, ie gedit

gksudo gedit /etc/default/grub

Look for the line


and add acpi_backlight=vendor to it so that it reads

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Update grub to include the changes done

sudo update-grub


sudo reboot
  • Thanks for the suggetion. I've tried that one as well, but it doesn't solve the problem for me.
    – MartinDK
    Feb 14, 2012 at 14:14

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