How to fix Acer Aspire 4736z back light brightness control in Ubuntu 13.04?

Question

A simple way to fix Acer Aspire 4736z back light brightness control problem using hot keys (Fn + Brightness +-)

Answer 1

Open up the terminal and type

sudo -H gedit /etc/default/grub

Find this line:

GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash"

Replace the line with this:

GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor"

Save the changes and close the editor then come back to the terminal and enter the below command to update the GRUB configuration:

sudo update-grub

Just reboot the machine.