I upgraded my bios, here is the output:

vid@G550:~$  sudo dmidecode -s bios-version && sudo dmidecode -s 
bios-release-date
[sudo] password for vid: 
G550JK.205
09/26/2014

It didn't solve the problem, so I guess this isnt due to outdated BIOS?
What solves my problem is adding 'acpi_osi=' to '/etc/default/grub' as
such:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

Can someone please explain what exactly is causing the problem and how
adding  'acpi_osi=' solvse it. Thanks!

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https://bugs.launchpad.net/bugs/1506914

Title:
  Screen brightness not working using keyboard shortcut fn+F5/F6 not
  working.

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