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I installed ubuntu 12.04 on my laptop for first time and every thing work well but the only thing doesn't work is the brightness doesn't change when I press F5 and F6 with Fn

So I can't adjust the Brightness and sometimes I need to decrease it for more time working on battery

and the bubble appear that it changed but nothing happens

My laptop is Sony VAIO series F with NVIDIA GEFORCE ...

and NVADIA accelerated graphic driver is activated

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try this –  Web-E Sep 10 '12 at 8:03
    
i tried that but nothing happen –  amrelghobary Sep 11 '12 at 22:09

2 Answers 2

up vote 1 down vote accepted

LCD Brightness Control

Once you have installed the proprietary Nvidia drivers as suggested above, you may notice that your brightness control keys do not work properly. This is fixable by editing one's xorg.conf file. Open a terminal window and type the following:

sudo nano /etc/X11/xorg.conf

This will open your X server configuration (after prompting for your password). You should see a section titled "Device" that looks as follows:

Section "Device"
        Identifier      "Default Device"
        Driver  "nvidia"
        Option  "NoLogo"        "True"
EndSection

Append a line so it appears like this:

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

You will need to restart your graphical server (or reboot) for this change to take effect.

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If installing all updates and rebooting does not work, try installing nvidiabl,

a little Linux driver [...] that enables the control of laptop backlight connected to NVIDIA chip using the /sys/class/backlight interface.

It worked for me on an HP Elitebook 8570w.

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thanks you !! ... how can i install it –  amrelghobary Sep 12 '12 at 5:06
    
@Eng.amr19 Click on the link and scroll down... the README page is right there! –  gertvdijk Sep 12 '12 at 6:28
    
i can't understand it ... please just give me the instruction –  amrelghobary Sep 12 '12 at 7:54
    
@Eng.amr19 Download the latest version of the .deb package from the download section and install it using your package manager (dpkg, synaptic, Software Center, Gdebi, QApt Package installer, ...). It's like any other .deb package installation. –  gertvdijk Sep 12 '12 at 8:18
    
i tried that but it is the same no changes i still can't change the brightness –  amrelghobary Sep 13 '12 at 21:16

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