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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 acpi_listen and 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:

asus-nb-wmi  intel_backlight

and cat /sys/class/backlight/*/brightness

100 
562

I am using ubuntu 16.10.

Thanks for the help.

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