I wanted to decrease the brightness of the screen when my screen was locked.
here is the script I used to lock my screen with xautolock.
It calls i3lock, but it could be anything.
I'm using xrandr to get the screen name and decrease the brightness, then restore it on exit.
#!/bin/sh
set -e
primary=$(xrandr | grep " primary" | cut -f1 -d " " | head -n 1)
on_exit() {
xrandr --output $primary --gamma 1 --brightness 1
}
trap on_exit EXIT
xrandr --output $primary --brightness 0.8 --gamma 0.8
# enable the lock screen
i3lock --nofork -c 272d2d -i ~Documents/wallpaper-lockscreen.png
Here again it's important to use --nofork
parameter with i3lock
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