This is something I ran in to when origionally setting up my Folio, which I did not post on. However, today a co-worker asked me how to solve this problem, so I thought I should jot it down for future reference.
sudo vi /etc/default/grub.
Update the line containing
acpi_backlight=vendor to the end. It should look something like this when you're done:
# file: /etc/default/grub # ... GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=on acpi_backlight=vendor" # ...
Save and update grub with
Note: You will need to use an external monitor or drop in to grub's preboot command line and add the above to be able to see your screen before adding the above option.