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How to run i3lock after computer inactivity?

asked 2012-06-07 10:23:32 +0000

barchiesi gravatar image

updated 2012-06-08 13:22:48 +0000

I have a script that takes a screenshot of my screen and runs i3lock with that image. Now I would like to know how to start such script after x minutes of inactivity. Ideas?

EDIT: This is the script I'm using when I launch i3lock. It takes a picture then blurs it.

scrot /tmp/screen_locked.png
convert /tmp/screen_locked.png -scale 10% -scale 1000% /tmp/screen_locked2.png
i3lock -i /tmp/screen_locked2.png
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answered 2014-06-16 04:45:55 +0000

robru gravatar image

First of all, I just want to say, this is the coolest screen lock I have ever seen in my life. Thanks so much for sharing this idea ;-)

That said, I'm not super comfortable with leaving screenshots lying around in /tmp. Who knows what kind of sensitive info might be on my screen at any given time that the screen lock decides to activate. For security reasons, you should probably use this instead:

#!/bin/sh -e

# Take a screenshot
scrot /tmp/screen_locked.png

# Pixellate it 10x
mogrify -scale 10% -scale 1000% /tmp/screen_locked.png

# Lock screen displaying this image.
i3lock -i /tmp/screen_locked.png

# Turn the screen off after a delay.
sleep 60; pgrep i3lock && xset dpms force off

mogrify modifies the files in place, and is part of ImageMagick, so if you have convert installed, then you already have mogrify.

Also note my use of pgrep and xset for turning the display off after a minute. xset turns the display off, but the pgrep bit makes sure that i3lock is still running before turning the screen off -- this way if you unlock the screen within the first minute, your screen doesn't blink off while you're trying to do something.

Save that to a script, and then a couple lines in .i3/config and you're golden:

bindsym $mod+l exec "~/.local/bin/"
exec xautolock -time 15 -locker '~/.local/bin/' &

(I like Win+L for locking and I've disabled the jkl; motion keys personally)

Hope this helps!

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Now all I need is a way to visually indicate the screen is about to lock, and a way to abort the locking if a key is pressed....

robru gravatar imagerobru ( 2014-06-16 05:04:27 +0000 )edit

Scaling to 10% and then 1000% results in a fairly blocky image. Consider using `convert /tmp/screen_locked.png -blur 0x6 /tmp/screen_locked.png` instead. It does however take a few seconds for the image to be generated.

hbaughman gravatar imagehbaughman ( 2014-08-03 16:43:22 +0000 )edit

Note that "mogrify" takes approximately 2X as long as "convert". I use convert, then remove the original image.

bwv549 gravatar imagebwv549 ( 2014-11-20 15:35:47 +0000 )edit

To get a more "blocky" feel, I use: ``convert /tmp/screen_locked.png -scale 5% -scale 2000% /tmp/screen_locked.png``

stefanv gravatar imagestefanv ( 2015-04-03 18:41:46 +0000 )edit

after an incorrect attempt, the screen doesnt turn off after the countdown

airwindh gravatar imageairwindh ( 2015-11-11 12:19:39 +0000 )edit

answered 2012-06-07 11:05:36 +0000

Michael gravatar image

There is a tool called xautolock which is what you’re looking for :).

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answered 2012-06-15 03:06:29 +0000

Not directly involved with this question, but I thought it might be worth saying, I like the gnome style Ctrl+Alt+L for locking the screen.

You can achieve that in i3 by adding to config file:

bindsym Control+mod1+l exec i3lock

(or, in case your Alt is not mod1, just run xmodmap to get which one to use).

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answered 2013-01-23 14:06:55 +0000

dkeg gravatar image

updated 2013-01-23 14:08:38 +0000

using the aforementioned xautolock, you could call you script. Place this in you autostart section

exec xautolock -time 10 -locker 'i3lock /path/to/script' &

adjust you time accordingly

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I believe you want exec "xautolock -time 10 -locker 'path/to/script'"

yhager gravatar imageyhager ( 2014-04-01 19:48:13 +0000 )edit

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Asked: 2012-06-07 10:23:32 +0000

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Last updated: Jun 16 '14