Comment 35 for bug 262679

I don't know if I'm correct, but in my case, after doing some research, it proves unnecessary to install it.
What solves everything is:

<code>
sudo gedit /etc/default/grub
</code>

replace:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
with:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

and then:
<code>
sudo update-grub
</code>