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The maximum lock time in Ubuntu 18.04, when set via GUI, is 15 minutes. This can be set in SettingsPowerPower SavingBlank screen.

I'd like to increase this to 30 minutes for my machine at home. How can I do that?

21

Open Terminal and run:

gsettings set org.gnome.desktop.session idle-delay 1800

to set the "Blank screen" delay to 30 minutes or 1800 seconds (or set any value in seconds). You can use $((30*60)) to use minutes directly.

Note: After making the change, in SettingsPowerPower SavingBlank screen it will show "Never" as there is no entry for 30 minutes.

To lock: The number of seconds after blank screen activation before locking the screen (default: 0)

gsettings set org.gnome.desktop.screensaver lock-delay 0

Needed: Set this to TRUE (default) to lock the screen when the blank screen goes active

gsettings set org.gnome.desktop.screensaver lock-enabled true
  • 2
    there must be a way to define those picklist choices such that updated list will appear on UI afterwards – Scott Stensland Jul 16 '18 at 16:22
15

This can already be achieved via GUI.

When using Ubuntu 18.04 open Settings. There select the Privacy settings tab. Now the Screen Lock option will be visible. When clicked, a modal window with the specific settings will open.

There you can toggle Automatic Screen Lock on/off, set a time for locking the screen or respectively binding it to the screen turning off via Lock screen after blank for, last but not least Show Notifications lets you decide if notifications should be shown on the lock screen.

So the path for the option you want to change is:
Settings → Privacy → Screen Lock → Lock screen after blank for
There you can select 30 minutes as the lock screen time.

screenshot

  • 2
    Hmm... not sure whether it's the same thing. OP is asking for an option to change Blank screen delay, i.e. duration of inactivity that will turn screen off, whereas the settings you have mentioned is for "Lock screen after blank for" which I reckon means after the screen is off, how long the system will wait before locking the screen so that you'll have to provide your password on waking up. – pomsky Jun 25 '18 at 13:05
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    Well he said maximum lock time, which can be set to more then 15 minutes via GUI. That's all I pointed out, if not for the OP, it might be helpful to somebody. @pomsky – Nicolai Jun 25 '18 at 15:23
  • There is no Privacy tab or choice in my Settings panel in 18.04. – 42- Dec 22 '18 at 1:53
  • @42- It is there for me, so I don't know what to say. Might be called privacy settings or so, I'm not running it in English. Take a look at the documentation. – Nicolai Dec 22 '18 at 9:36
  • 2
    This answer is useful but what I was looking for is to immediately lock screen after blank – lock-delay 0 – and keep screen on for 30 minutes, or some other time, before the blank screen – idle-delay 1800; basically @pomsky 's answer. (This allows me to read from the screen during those 30 minutes.) – Daniel Jan 28 at 10:42
4

There are 2 different settings, one for blank screen and second for locking screen after blank.

1. Set timeout of "Blank Screen"

  • In GUI: SettingsPowerPower SavingBlank screen
  • In Terminal:

    gsettings set org.gnome.desktop.session idle-delay 1800
    

    to set the "Blank screen" delay to 30 minutes or 1800 seconds (or set any value in seconds).

    Note: After making the change, in Settings GUI editor it will show "Never" as there is no entry for 30 minutes.

2. Set timeout of "Lock screen after blank"

  • In GUI: SettingsPrivacyScreen LockLock screen after blank for
  • In Terminal:

    gsettings set org.gnome.desktop.screensaver lock-delay 600
    

    to set the "Lock screen after blank for" delay to 10 minutes or 600 seconds (or set any value in seconds). Set 0 to lock immediately after blank screen.

To sum up

Combining these 2 parameters user is able to achieve for example:

  • Blank screen after 10 minutes but lock after another 10 minutes (20 minutes overall to lock).
  • Blank screen after 5 minutes and lock immediately.
  • Blank screen after 30 minutes and lock after another 1 hour
  • Any other combination depending on user's need.

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