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My hardware supports full 256 steps of screen brightness. Unfortunately Ubuntu's default brightness driver uses wrong steps: I need to increase granularity of steps in the dark end of the spectrum, and decrease on the bright end.

The following script bright.sh demonstrates how I'd like the brightness to be handled:

#/bin/bash
sciezka="/sys/class/backlight/intel_backlight"
if [ "$1" == "+" ]; then
    maxbright=`cat $sciezka/max_brightness`
    bright=`cat $sciezka/brightness`
    bright=`echo "print(int(min($maxbright,$bright + max($bright * 0.5, 1))))" | python`
else
   if [ "$1" == "-" ]; then
    bright=`cat $sciezka/brightness`
    bright=`echo "print(int(max(0,$bright - max($bright * 0.33, 1))))" | python`
   fi
fi
echo $bright | sudo tee $sciezka/brightness

How do I replace the XF86KbdBrightnessDown and XF86KbdBrightnessUp handler with my custom one? I'd like to keep this cool OSD slider, but use my logic for the actual brightness adjustment.

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