I just bought a new laptop and i have installed windows 8 and ubuntu 12.04 on it. And while using ubuntu i am not able to control my brightness with the dedicated keys or the softwares such as brightness controller and brightness indicator.

I have also tried to search the brightness directory with the command grep . /sys/class/backlight/*

and this is showing no such file or directory error.

So what should i do now..

I have also tried making changes in the grub file.

i have added acpi_backlight=vendor in the grub cmdline default line...

Please help my laptop is working in max brightness and its difficult to work...


you can install xbacklight by running:

sudo apt-get install xbacklight -y

then Go System Settings > Keyboard > Shortcuts > Custom Shortcuts

Add followings :

Brightness Down = xbacklight -10
Brightness Up = xbacklight +10

then click on "Disabled" and press your preferred combinations keys (for ex. CTRL+F2 and CTRL+F3)

  • But it is not working..:( I think maybe i need to install some drivers or something. ?? – Tejvir Singh Jan 19 '14 at 15:40
  • Have you updated your grub after changing those modifications ? – OnlyMAJ Jan 19 '14 at 18:58
  • if it doesn't work, you should just upgrade to 13.10 . it'll work definitely – OnlyMAJ Jan 19 '14 at 19:16
  • Yeah i have updated my grub after making those modifications but its still not working.. – Tejvir Singh Jan 21 '14 at 11:32
  • @Tejvir Upgrade ubuntu to 13.10 !!! – OnlyMAJ Jan 21 '14 at 11:39

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