An even better script so that all connected displays have their
brightness adjusted
#!/bin/bash
#-----------------------------------------------------------------
# /usr/local/bin/brightness
# be sure this file is executable
#-----------------------------------------------------------------
backlight_path=/sys/class/backlight/intel_backlight
luminance() {
read -r level < "$backlight_path"/actual_brightness
bc <<< "scale=10;$level/$max"
}
devices() {
xrandr | grep -w connected | awk '{ print $1 }'
}
apply() {
for device in $(devices)
do
echo "$device" "$1"
xrandr --output "$device" --brightness "$1"
done
}
read -r max < "$backlight_path"/max_brightness
apply "$(luminance)"
inotifywait -me modify --format '' "$backlight_path"/actual_brightness | while
read; do
apply "$(luminance)"
done
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https://bugs.launchpad.net/bugs/1831587
Title:
brightness control not work with OLED panel
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https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions
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