Adjust Oled brightness settings for Dell XPS 7590 (intel drivers)

brightness.txt

.45

i3c-brightness.sh

#!/bin/bash

BRIGHT=`cat brightness.txt`

if [ "$1" = '+' ]; then
    echo "+"
    NEWBRIGHT=$(echo "$BRIGHT + 0.05" | bc)
    if [ "$(echo "$NEWBRIGHT > 1.0" | bc)" -eq 1 ]; then
        NEWBRIGHT='1.0'
    fi
elif [ "$1" = '-' ]; then
    echo "-"
    NEWBRIGHT=$(echo "$BRIGHT - 0.05" | bc)
    if [ "$(echo "$NEWBRIGHT < 0.0" | bc)" -eq 1 ]; then
        NEWBRIGHT='0.0'
    fi
fi
echo "${NEWBRIGHT}"
`xrandr --output eDP-1 --brightness $NEWBRIGHT`
echo "$NEWBRIGHT" > brightness.txt

Oled brightness settings on Dell XPS 15 7590 in i3wm

From i3wm config file:
"
...
# Sreen brightness controls
bindsym XF86MonBrightnessUp exec "~/bin/i3-brightness.sh +"
bindsym XF86MonBrightnessDown exec "~/bin/i3-brightness.sh -"
...
"
In your home /bin folder (i3-brightness.sh):
#!/bin/bash

BRIGHT=`cat brightness.txt`

if [ "$1" = '+' ]; then
    echo "+"
    NEWBRIGHT=$(echo "$BRIGHT + 0.05" | bc)
    if [ "$(echo "$NEWBRIGHT > 1.0" | bc)" -eq 1 ]; then
        NEWBRIGHT='1.0'
    fi
elif [ "$1" = '-' ]; then
    echo "-"
    NEWBRIGHT=$(echo "$BRIGHT - 0.05" | bc)
    if [ "$(echo "$NEWBRIGHT < 0.0" | bc)" -eq 1 ]; then
        NEWBRIGHT='0.0'
    fi
fi
echo "${NEWBRIGHT}"
`xrandr --output eDP-1 --brightness $NEWBRIGHT`
echo "$NEWBRIGHT" > brightness.txt

Before running the first time:
cd ~/bin/
echo .45 >> brightness.txt

Restart i3wm

You should not be able to adjust screen brightness with your funciton keys