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I've installed Ubuntu 16.04 on two different laptops:

  • Lenovo Thinkpad T460s
  • HP Probook 6470b

My configuration is similar across both laptops. I have i3 WM installed, with lightdm (the default on 16.04).

In Unity, when closing the lid, lock+suspend works fine on both laptops.

In i3 WM, the behavior changes between both laptops:

  • On the T460s, when I close the lid, the laptop locks + suspends. The lock screen is the gnome-screensaver e.g. gnome-screensaver-command -l.

  • On the Probook, when I close the lid, the laptop only suspends. It doesn't lock.

Where is the "lock + suspend on lid close" behavior defined?

Extra information:

I spent some time trying to find where this behavior was defined. False leads include:

  • /proc/acpi/lid.sh
  • "HandleLidSwitch" in /etc/systemd/logind.conf

Most strangely, I installed ZSH today on the Probook (usually a Bash guy, wanted to give it a shot) and it started lock + suspend on lid close, with the same gnome-screensaver-command -l behavior as the T460s.

I uninstalled and re-installed ZSH and it disappeared, now it just suspends without locking.

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