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I just installed Ubuntu 13.10 in my Dell Inspiron 3421. Previously there was no problem with the screen brightness.

But in Ubuntu 13.10 i was having the problem with screen brightness. I normally work with low screen brightness.

But whenever i restart my Laptop the Screen Brightness was set to maximum. If you are also having this same problem then i have found the fix for this. Let’s see how i was able to fix the screen brightness issue.

First open the Terminal and type

sudo gedit /etc/rc.local

Ubuntu 13.10 Terminal

and it will open file(rc.local in gedit) then add the following code just above the line exit 0

echo 7 > /sys/class/backlight/acpi_video0/brightness

You can change 7 which is the brightness level.

Source: Ask Ubuntu