66 lines
1.7 KiB
Bash
66 lines
1.7 KiB
Bash
#!/bin/bash
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# Example notifier script -- lowers screen brightness, then waits to be killed
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# and restores previous brightness on exit.
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## CONFIGURATION ##############################################################
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# Brightness will be lowered to this value.
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min_brightness=0
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# If your video driver works with xbacklight, set -time and -steps for fading
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# to $min_brightness here. Setting steps to 1 disables fading.
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fade_time=200
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fade_steps=20
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# If you have a driver without RandR backlight property (e.g. radeon), set this
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# to use the sysfs interface and create a .conf file in /etc/tmpfiles.d/
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# containing the following line to make the sysfs file writable for group
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# "users":
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#
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# m /sys/class/backlight/acpi_video0/brightness 0664 root users - -
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#
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#sysfs_path=/sys/class/backlight/acpi_video0/brightness
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# Time to sleep (in seconds) between increments when using sysfs. If unset or
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# empty, fading is disabled.
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fade_step_time=0.05
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###############################################################################
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get_brightness() {
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if [[ -z $sysfs_path ]]; then
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brightnessctl g
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else
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cat $sysfs_path
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fi
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}
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set_brightness() {
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if [[ -z $sysfs_path ]]; then
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xbacklight -steps 1 -set $1
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else
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echo $1 > $sysfs_path
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fi
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}
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fade_brightness() {
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if [[ -z $sysfs_path ]]; then
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xbacklight -time $fade_time -steps $fade_steps -set $1
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elif [[ -z $fade_step_time ]]; then
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set_brightness $1
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else
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local level
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for level in $(eval echo {$(get_brightness)..$1}); do
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set_brightness $level
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sleep $fade_step_time
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done
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fi
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}
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trap 'exit 0' TERM INT
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trap "set_brightness $(get_brightness); kill %%" EXIT
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fade_brightness $min_brightness
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sleep 2147483647 &
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wait
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