Acer Laptop Brightness Fix
This tutorial provides a fix for the inability of adjusting brightness on Linux laptops. The following tutorial has been confirmed as a solution for fixing the brightness controls on an Acer Aspire 5741. The tutorial is carried out by modifying GRUB.
Edit GRUB with your favorite text editor
Add the following entries to these specific lines (do NOT delete any arguments you currently have, e.g. encryption).
Update GRUB (e.g for Arch Linux)
grub-mkconfig -o /boot/grub/grub.cfg
*Note, if you are dual booting with Windows, make sure you re-add your Windows entry to /boot/grub/grub.cfg A tutorial for that may be found here.