Ubuntu 12.04 Fix Screen Brightness For Lenovo G580 Laptop

I’m posting this to help anyone that has the same problem I did.  The problem was that my Lenovo G580 screen stayed at max brightness after installing Ubuntu 12.04 LTS (32bit).  The brightness up / down buttons did nothing.  During the day it wasn’t much of a problem but in the evening the screen was too bright.  The fix was pretty simple:

Edit the grub file:
sudo vi /etc/default/grub

Change this line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

So that it says:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Save and exit the file.

Now update grub:
sudo update-grub

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