a.sh

#!/bin/bash
# # control brightness
# # example ./a.sh -10
# # example ./a.sh +10

# backlight=/sys/class/backlight/amdgpu_bl1/brightness

# currentbrightness=(`cat $backlight`)

# value=`expr $currentbrightness + $1`
# echo $value%
# brightnessctl set $value

# old one not working !
MON="eDP"        # Discover monitor name with: xrandr | grep " connected"
MON1="HDMI-1"    # Discover monitor name with: xrandr | grep " connected"
STEP=5           # Step Up/Down brightnes by: 5 = ".05", 10 = ".10", etc.

CurrBright=$( xrandr --verbose --current | grep ^"$MON" -A5 | tail -n1 )
CurrBright="${CurrBright##* }"  # Get brightness level with decimal place

Left=${CurrBright%%"."*}        # Extract left of decimal point
Right=${CurrBright#*"."}        # Extract right of decimal point

MathBright="0"
[[ "$Left" != 0 && "$STEP" -lt 10 ]] && STEP=10     # > 1.0, only .1 works
[[ "$Left" != 0 ]] && MathBright="$Left"00          # 1.0 becomes "100"
[[ "${#Right}" -eq 1 ]] && Right="$Right"0          # 0.5 becomes "50"
MathBright=$(( MathBright + Right ))

[[ "$1" == "Up" || "$1" == "+" ]] && MathBright=$(( MathBright + STEP ))
[[ "$1" == "Down" || "$1" == "-" ]] && MathBright=$(( MathBright - STEP ))
[[ "${MathBright:0:1}" == "-" ]] && MathBright=0    # Negative not allowed
[[ "$MathBright" -gt 999  ]] && MathBright=999      # Can't go over 9.99

if [[ "${#MathBright}" -eq 3 ]] ; then
    MathBright="$MathBright"000         # Pad with lots of zeros
    CurrBright="${MathBright:0:1}.${MathBright:1:2}"
else
    MathBright="$MathBright"000         # Pad with lots of zeros
    CurrBright=".${MathBright:0:2}"
fi

if [[ $MathBright -lt 10000 ]]
then
    exit 0
elif [[ $MathBright -gt 100000 ]]
then
    exit 0
fi

xrandr --output "$MON" --brightness "$CurrBright"   # Set new brightness
xrandr --output "$MON1" --brightness "$CurrBright"

# Display current brightness
printf "Monitor $MON "
echo $( xrandr --verbose --current | grep ^"$MON" -A5 | tail -n1 )