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Hi everyone i'm having a problem that for what i have seen its very common with the latest version of ubuntu.

So I updated my graphics drivers on my laptop to the latest nvidia ones but now my brightness keys do not work anymore. I used Fn + F5 to lower brightness and Fn + F6 to increase it.

I have a Sony Vaio laptop model VPCCW25FL and my GPU is an Nvidia GT330M. I have been trying some of the solutions answered here but none of them seem to work. I'm really annoyed by this and it's a chore that every so often I have to run a terminal command to lower the brightness but after a while it increases again!

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Possible duplicate of Controlling Brightness in Sony Vaio SVE151A11W |Not Working| – Eliah Kagan Jan 26 '13 at 17:08

it happened to me

my system info ubuntu 14.04
nvidia gt330m


note: if you havent installed nvidia driver. Install it before you continue this.

in terminal

# nvidia-xconfig

this creates /etc/X11/xorg.conf . edit it.

# sudo su  // become root
# gedit /etc/X11/xorg.conf 

find Section "device" in text. and add this

 Option "RegistryDwords" "EnableBrightnessControl=1"

it shold look like it on the rightside

from this                        TO   this     
Section "Device"                  | Section "Device"
 Identifier "Device0"             |   Identifier  "Device0"
 Driver     "nvidia"              |   Driver      "nvidia"
 VendorName "NVIDIA Corporation"  |   VendorName  "NVIDIA Corporation"
                                  |   Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection                        | EndSection

save changes (ctrl+S).
log out. log in.

we are done!! now Fn + Up,Down is adjusting the brightness.

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