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I have just installed Ubuntu 13.10 and trying to adjust my laptop screen brightness. My laptop Dell studio 1558 has a key to change the screen brightness, though I reduced brightness to zero, I still see the brightness didn't change at all. Because of this my battery to running out quickly.

Is there any software which really makes a change in brightness.

I have tried the 'brightness and lock' in Ubuntu, but of no use.

Your help is really appreciated.

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possible duplicate… – Raja Nov 24 '13 at 4:11
Is the Ubuntu system up-to-date? This may be a bug that has been fixed via update. – Devyn Collier Johnson Nov 24 '13 at 4:25

3 Answers 3

if i understand your post correctly this is because the brightness hotkeys do not work? if so try changing:


to this:

GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"

in the file /etc/default/grub, then:

sudo -i update-grub

after this hotkeys should be functional

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I too faced this problem with my laptop until I found this.There is a simple command line to fix this brightness problem.Open the terminal and type in it this command:

sudo setpci -s 00:02.0 F4.B=1f

and enter your password if it asks for.Now note the last thing in here "1f",it gives the brightness on a hexadecimal scale (00-ff) where 00 is the least brightness and ff is the maximum.


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This may well have something to do with your graphics card. Do you have NVIDIA?

I've had the same problem; it was due to the Nouveau graphics card driver that Ubuntu installs as a default.

Open 'Software & Updates' and go to the tab 'Additional drivers'. It will tell you which graphics card driver it is using. Switch to NVIDIA's recommended proprietary driver. Reboot, and adjusting brightness should now work.

Be alerted: the new driver will mess up your nice splash screen in the beginning, but apart from that, everything will run fine.

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