Hi
Open a terminal and type
Code:
sudo nano /etc/default/grub
Enter your password. It will not be echoed to the screen.
Look for the line that says
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
and change it so it says
Code:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash
acpi_backlight=vendor"
Press ctrl + o to save and ctrl + x to exit.
Then type
Code:
sudo update-grub
Reboot your PC and check your function keys. Post back if it doesn't work.
Edit: Just in case you missed it i have highlighted what you need to enter.
Kind regards
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