Screen Brightness Issues with New Ubuntu Kernel

After updating to the new Ubuntu kernel I found that my brightness setting would only stop at the minimum and maximum settings.

Although it worked by echoing the correct brightness level via terminal, this was a very long winded way of doing it.

A simpler way was to edit the GRUB boot loader by typing:

gksudo gedit /etc/default/grub

Then changing the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Lastly typing:

sudo update-grub

and rebooting.

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