How to show the login screen instead of the lock screen?

Solution 1:

To create the shortcut

• Go to the Settings Manager from the menu.
• Go to Keyboard.
• In the Application Shortcuts tab press on Add.
• Enter dm-tool switch-to-greeter then press OK.
• Press the desired hotkey.

To run a command after 2 idle minutes

• Create a bash script, containing:

#!/bin/bash

# The target may depend on your system. i8042 is mouse and keyboard on mine.
log=/proc/interrupts
target=i8042

measure_activity() 
{ 
    count=$1
    interrupts_start=`grep $target $log | awk '{ print $2 }'`
    interrupts_stop=`sleep 1 && grep $target $log | awk '{ print $2 }'`

    if [ "$interrupts_start" == "$interrupts_stop" ] ; then
        ((count++))
        if [ $count -eq 120 ] ; then
            dm-tool switch-to-greeter
            measure_activity 0
        else
            measure_activity $count
        fi
    else
        measure_activity
    fi
}

measure_activity 0 &

• Make it executable.

• Add it to Application Autostart tab of Session and Startup.

P.S.: I've got the script from here and I edited it for you.