Quote Originally Posted by ed anger View Post
Guys! It should work for everyone! First it didn't work for me, but I've noticed that the problem is with quotation marks in added line:

GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”

Replace quotation marks from this line (in /etc/default/grub) with quotation marks that you type yourself. It has worked for me!

This worked for me aswell on my ASUS UL20a! I am very happy to see the community pull through with so much great info!