Comment 47 for bug 1257766

I have the same problem with a ZBook 14 with Intel/AMD graphics. My current workaround is to use this script (which is actually what I use on my desktop at night):

#!/bin/bash
xrandr -q | grep " connected" | awk '{print $1}' | while read d; do
  echo "setting $d"
  xrandr --output $d --brightness $1
done

Then just call "set-brightness 0.6" for 60% etc. This doesn't bind to the F9 / F10 buttons, but does the trick.

HTH