Ubuntu – Not Locking Screen after X minutes

I am running a script for same problem (source):

#!/bin/bash
sleep 0.5
xset dpms force off
gnome-screensaver-command -l 

This turns monitor off and locks the session. The sleep 0.5 is there to avoid the monitor turning on when you release the Ctrl+Alt keys; maybe you don't need this.

You can try other solution also from there (didn't tried this one yet).

The solution I use is:

1. I have added the Inhibit Applet to my top panel (this lets me toggle the sleep mode off and on)

2. In power management I set Put display to sleep when inactive for: 1 minute.

3. I use the Ctrl+Alt+L (I actually changed my shortcut to Ctrl+Alt+Spacebar) to lock the screen.

So when I am using the laptop the first thing I do is click on my Inhibit Applet in my top panel so my display does not go to sleep in 1 minute of inactivity.

When I am all done and want to lock the screen and turn off the monitor I click on the Inhibit Applet so it allows the sleep timer to work, and I hit my combination of keys to lock the screen Ctrl+Alt+L.

The Screen is locked and in 1 minute the display turns itself off.

If you need or want a solution that prevents the screen to fall asleep, but that does dim/lock the screen after a while, there is another solution: instead of the system's own dim/lock option, use the script below to run in the background. You will need to install xprintidle.

How to set up:

• Disable all dim / lock options in System Settings. (In Brightness & lock AND in "Energy" settings)

• install xprintidle:

  sudo apt-get install xprintidle
  

• Find your screen name; run in a terminal:

  xrandr
  

  Look for the name in the line where it says "connected". Your screen name could be for example VGA-1 or DVI-I-1.

• Copy the script below, set the correct screen_name, the idle time before it should lock/dim the screen, and paste it into an empty file. Save it aslock_dim.py

The script

#!/usr/bin/env python3

import subprocess
import time

seconds = 600 # number of seconds to wait before lock/dim the screen
screen_name = "DVI-I-1" # example, replace it with your screen's name

awake = True

while True:
    curr_idle = subprocess.check_output(["xprintidle"]).decode("utf-8").strip()
    if awake == True:
        if int(curr_idle) > seconds*1000:
            command1 = "gnome-screensaver-command -l"
            command2 = "xrandr --output "+screen_name+" --brightness 0.1"
            subprocess.call(["/bin/bash", "-c", command1])
            subprocess.call(["/bin/bash", "-c", command2])
            awake = False
        else:
            pass
    elif awake == False:
        if int(curr_idle) > seconds*1000:
            pass
        else:
            command3 = "xrandr --output "+screen_name+" --brightness 1"
            subprocess.call(["/bin/bash", "-c", command3])
            awake = True
    time.sleep(2)

Test the script by opening a terminal and type:

python3 /path/to/lock_dim.py

If it works as you like, add it to your startup applications: Open Dash > "Startup Applications" > "Add", add the command:

python3 /path/to/lock_dim.py