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I have a Sony Vaio VPCEG15FX, I have been trying to install Ubuntu, but the same problem occurs with the screen, I am unable to control the Brightness using the laptop Hot keys.

Until two days ago I was able to control the screen brightness with a specific Instruction (Among so many different options that I found but never worked), which I used according to what I read in one post (Can't adjust brightness in a sony vaio T13 ultrabook), as follows :

echo 1000 > /sys/class/backlight/intel_backlight/brightness

Which I entered in the folowing file : /etc/rc.local.

I have read different posts, different solutions, scripts, etc.; I don't know if I am the only Sony vaio user of this specific Model with this problem, but I would like to be able to use the Hot Keys (FN + F5 : FN + F6).

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closed as off-topic by Seth Sep 14 '14 at 14:23

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers." – Seth
If this question can be reworded to fit the rules in the help center, please edit the question.

3 Answers 3

For everyone with a similar problem, Moderator TOZ found a solution for my problem in the following thread :

Thanks everyone for your time and attention.

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  fossfreedom Nov 24 '12 at 9:30
  1. Try the following commands

    sudo gedit /etc/X11/xorg.conf
  2. You will be prompted for password, enter your user account password.

  3. A xorg.conf file will be opened with following contents

    Section "Device"
        Identifier  "Default Device"
        Option  "NoLogo"    "True"
  4. Add the following line within the section.

    Section "Device"
        Identifier  "Default Device"
        Option  "NoLogo"    "True"
        Option "RegistryDwords" "EnableBrightnessControl=1"
  5. Just save it and close.

  6. Enter the following command.

    sudo gedit /etc/default/grub
  7. Similarly enter the password as before & a file will be opened, find the lines below

  8. Change it to the following

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video"
  9. Save and close it.

  10. Then update the grub with the following command

    sudo update-grub
  11. Reboot your system, this will work. I resolved for my nvidia supported Vaio VPCEH28FN.

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Just connect your system with internet when you open UBUNTU and open 'Additional Drivers' application. Then it automatically shows the available graphics drivers for your system. You can install from there and that's fine. Now by the Hot Keys (FN + F5 : FN + F6) you can manage your system brightness.

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Hello there ! Thanks a lot for your help, but Certainly that's the first option, which Never worked. It always shows that there are No drivers available. The wireless card worked after doing all updates and upgrades, it never worked using the additional drivers tool. I have seen tutorials using scripts and files for acpi events, but they did not work for me either. Thanks for you help. –  martzp Nov 20 '12 at 8:22

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