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
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https://bugs.launchpad.net/bugs/1257766
Title:
can not reduce brightness on HP ZBook
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