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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 askubuntu.com/questions/149054/… –  raaz 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
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2 Answers

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

GRUB_CMDLINE_LINUX=""

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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