I have an asus F554L laptop and the fn + f5, f6 brightness control keys are not working. I can control the brightness through settings. I have tried adding
pcie_aspm=force acpi_osi= to
GRUB_CMDLINE_LINUX_DEFAULT, but the only thing it does is to stop me from controlling brightness from settings.
I have tried to run
xev, but they do not generate any output when I press the keys, although the other fn keys do show output and work correctly.
I have not tried to modify/create
20-intel.conf because I have a nvidia graphics card.
ls /sys/class/backlight shows:
I am using ubuntu 16.10.
Thanks for the help.