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Fix for Brightness Fn keys in Arch Linux and derivatives

Some weeks ago I switched to Arch in my notebook Toshiba Satellite L845D, and one of the first problems I've got was that my Fn keys that control the screen brightness weren't working (the rest worked just fine), so (after some days) I started to look for a solution.

- The first step was to install a package (which I'm not completely sure it's necessary) named gnome-settings-daemon-backlight-toshiba. To do this, we have to use AUR.

$ yaourt -S gnome-settings-daemon-backlight-toshiba

Or we can search for it..

$ yaourt toshiba

- Now we have to edit a line in our grub. You can use nano, gedit, mousepad, etc.

$ sudo nano /etc/default/grub

Now in the line GRUB_CMDLINE_LINUX we have to add acpi_osi=Linux and acpi_backlight=video. The value of the last one, acpi_backlight=video can vary depending on your hardware. These are the possible options:

acpi_backlight=video
acpi_backlight=vendor
acpi_backlight=native
acpi_backlight=none

The line should look similar to this one:

GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=video"

- Save and close. Now update grub with the following command:

$ sudo grub-mkconfig -o /boot/grub/grub.cfg

Or for the ones used to update-grub..

$ yaourt -S update-grub
$ sudo update-grub 

And thats it, just reboot and try it out.
For more information about the topic here is a link to the ArchWiki - Backlight section, where you can find the values I gave you above and much more.

Hope it helps!

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