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I run macOS Mojave 10.14.6 on a MacBook Pro (Retina, 15-inch, Early 2013). Except when specified, all settings and behaviours described in this post refer to the Mac connected to a power adapter.

My Mac is configured to sleep after 20 minutes of inactivity. The display is configured to sleep after 8 minutes, and the screensaver is configured to start after 2 minutes.

The mac is also configured to require a password 15 minutes after sleep or screen saver begins. For clarity, this setting:

System Preferences > Security and Privacy > General

enter image description here

However, the Mac doesn't sleep when that setting (screenshot) is set to 15 minutes. It also does not ask me to enter the password.

What happens:

  1. I stop interacting with the Mac.
  2. After 2 minutes the screen saver starts.
  3. Time passes: I've tested this waiting for several hours.
  4. The mac never sleeps, and the display never sleeps either. The screensaver simply keeps playing.
  5. I interact with the mac: move my finger on the touchpad, press a key.
  6. The screensaver gets interrupted and I'm back to my desktop. I am not asked to enter my password.

It works fine with smaller time values: immediately, 5 second, 1 minute and 5 minutes. With those values, the mac goes to sleep as expected (the display sleeps, I assume the mac sleeps as well), and when woken it's locked and it asks me to enter my password as expected.

I haven't tested it yet with larger values (1 hour, 4 hours, 8 hours), but I'll update the question when I have.

This are my pmset -g values when connected to the charger:

System-wide power settings:
Currently in use:
 standbydelaylow      4200
 standby              1
 womp                 0
 halfdim              1
 hibernatefile        /var/vm/sleepimage
 powernap             1
 gpuswitch            2
 networkoversleep     0
 disksleep            0
 standbydelayhigh     4200
 sleep                20
 autopoweroffdelay    28800
 hibernatemode        3
 autopoweroff         1
 ttyskeepawake        1
 displaysleep         8
 highstandbythreshold 50
 acwake               0
 lidwake              1

I've also discovered that on battery power nothing works. The screen saver doesn't even start. The battery power pmset -g values:

System-wide power settings:
Currently in use:
 standbydelaylow      4200
 standby              1
 halfdim              1
 hibernatefile        /var/vm/sleepimage
 gpuswitch            2
 powernap             0
 disksleep            10
 standbydelayhigh     4200
 sleep                10
 autopoweroffdelay    28800
 hibernatemode        3
 autopoweroff         1
 ttyskeepawake        1
 displaysleep         2
 highstandbythreshold 50
 acwake               0
 lidwake              1
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