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I installed Ubuntu 12.04 today on my Samsung RV509 Notebook (Nvidia Geforce 315M) and the backlight brightness controls don't work on it.

I did some digging around the web and found the samsung tools voria repository and installed Samsung-backlight package from there. This didn't help though.

I see that the Nvidia drivers are in use. Any help or pointers are appreciated.

Bruno Pereira
  • 74,715
Nands
  • 121

3 Answers3

1

You may try this:

gksudo gedit /etc/default/grub

Find this line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

And change to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and close the file. Then update grub:

sudo update-grub

Reboot and check.

This did the trick for me on a Samsung NP300 notebook. The brightness keys in the keyboard were not working before this. Hope this helps.

Tom
  • 491
1

Run:

gksu gedit /etc/X11/xorg.conf

Add

Option "RegistryDwords" "EnableBrightnessControl=1"

to the “Device” section so it looks somewhat like this:

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

Then restart the X server.

Eliah Kagan
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sergwy
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0

I suggest that you use Ubuntu 11.10. And install all the available drivers from the Voria repo. Make sure you have nvidia_bl installed which is required to correctly manage brightness.

sergwy
  • 31