cli for brightness and gamma adjustment for non apple monitors

[lvnilesh]

I am not super familiar with Omakub specific key-binding implementation so I am here to offer a simple cli script that helps in brightness and gamma control for non-apple monitors.

#! /bin/bash
# Script for adjusting display brightness and gamma
# This script assumes that you have two monitors connected via DP-0 and DP-4
# run `xrandr --verbose` or just `xrandr` to find the detail about the monitors you have connected.

# Ensure input is a valid number and convert it to a decimal
if [[ "$1" =~ ^[0-9]+$ ]] && (( $1 >= 1 && $1 <= 10 )); then
  [ "$1" = 10 ] && percent="1" || percent="0.$1"
else
  echo "Usage: $0 <brightness level (1-10)> [night]"
  exit 1
fi

# Ensure brightness is never lower than 0.1
(( $(echo "$percent < 0.1" | bc -l) )) && percent="0.1"

# Adjust brightness
xrandr --output DP-4 --brightness "$percent"
xrandr --output DP-0 --brightness "$percent"

# Adjust gamma if "night" mode is passed
if [ "$2" = "night" ]; then
  xrandr --output DP-4 --brightness "$percent" --gamma 1.0:0.95:0.85
  xrandr --output DP-0 --brightness "$percent" --gamma 1.0:0.95:0.85
else
  xrandr --output DP-4 --brightness "$percent" --gamma 1.0:1.0:1.0
  xrandr --output DP-0 --brightness "$percent" --gamma 1.0:1.0:1.0
fi

# Display current settings
xrandr --verbose | grep -E "Brightness|Gamma" | tail -n2

# Optional fun message
[ "$1" != 10 ] && echo "Stayin' up late, huh? Or maybe just pretending to be a hacker?" | lolcat

[lvnilesh]

here is the stepper script for brightness-control based on the above dimmer

For the non-apple monitor users, this stepper script could be mapped like this:

• CTRL-F1 brightness-control down

• CTRL-F2 brightness-control up

#!/bin/bash

# Get current brightness level
current_brightness=$(xrandr --verbose | grep -m 1 -i brightness | awk '{print $2}')

# Define step size for brightness change
step=0.1

# Adjust brightness based on argument
if [ "$1" = "up" ]; then
  new_brightness=$(echo "$current_brightness + $step" | bc)
elif [ "$1" = "down" ]; then
  new_brightness=$(echo "$current_brightness - $step" | bc)
else
  echo "Usage: $0 up|down"
  exit 1
fi

# Ensure brightness stays within 0.1 to 1.0 range
if (( $(echo "$new_brightness < 0.1" | bc -l) )); then
  new_brightness=0.1
elif (( $(echo "$new_brightness > 1.0" | bc -l) )); then
  new_brightness=1.0
fi

# Apply new brightness value
xrandr --output DP-4 --brightness "$new_brightness"
xrandr --output DP-0 --brightness "$new_brightness"

# Optional: Display new brightness
echo "Brightness set to: $new_brightness"

[lvnilesh]

# Turn bightness down on non-Apple monitor (requires brightness-control installed)
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom4/ name 'Apple Brightness Down (ASDControl)'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom4/ binding '<Control>F1'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom4/ command "sh -c 'brightness-control down"

# Turn bightness up on non-Apple monitor (requires brightness-control installed)
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom5/ name 'Apple Brightness Up (ASDControl)'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom5/ binding '<Control>F2'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom5/ command "sh -c 'brightness-control up'"

[dhh]

Nice! Looks like your script has hardcoded the monitors, though, right? With DP-4 and DP-0 mentioned explicitly. Would probably need something generic there.

[okdas]

Oh thanks @lvnilesh — this is something I need!

Will check what can be done with hardcoded monitors.