Display keeps turning off after 30 seconds no matter what the settings say.

I have my Mac mini connected to two monitors via USB-C cables. Regardless of the settings under Lock Screen, after I lock the computer, 30 seconds later the displays turn off and (I guess) the Mac goes to sleep. Is this a bug or am I missing something?


Mac mini, macOS 14.0

Posted on Oct 5, 2023 3:06 PM

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Posted on Jan 27, 2024 9:29 AM

Hi, Thanks for the advice.


  1. Executed ~ sudo pmset restoredefaults
  2. Then restart my Macbook pro.
  3. Then logged in
  4. set
  5. set
  6. press Ctrl+Cmd+Q to lock screen
  7. screen is locked and after 30 seconds, all external displays lost signals. built-in display turned black
  8. waited 10 minute and woke up laptop by keyboard
  9. logged in again
  10. all apps were shuffled across different Desktops


So, by pressing Ctrl+Cmd+Q to lock screen, the laptop will turn all displays off after 30 seconds, no matter what the setting are.

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35 replies

Jan 27, 2024 4:53 AM in response to Jerry_D

I have the same problem. No matter how I change the Lock Screen settings, the displays turned off at 30 seconds after the screen is locked.


Worst part is, after the displays turned off, and when I log back in again, previously opened apps are shuffled randomly across different Desktops. And then I have to move the apps back to the desired Desktops, again and again. Very Sad!!!


I guess I cannot leave my desk long now (I can leave, but cannot lock the screens). I am forced to be "productive", lol.

Jan 27, 2024 10:01 AM in response to BDAqua

Yeah, I won't have this problem if there are no external displays. i guess this app shuffling issue is considered edge case.


So, to avoid the app shuffling, I just need to prevent the laptop to fall into sleep (at least during my work hours).


But by doing Lock Screen, the laptop will fall into sleep after 30 seconds, so I cannot just Lock Screen by pressing Ctrl+Cmd+Q


My compromise is to set: "Start screen Saver when inactive" to 1 minute; set "turn display off on power adapter when inactive" to 2 hours; set "require password after screen saver begins or display is turned off" to immediately; enable "prevent automatic sleeping on power adapter when the display is off" (not sure why this one is not preventing sleeping already?!).


Then i just let my laptop be idle for 1 minute before i leave my desk. Doing so, the screen saver is running and screen is locked by itself, and it will not sleep until after 2 hours. I usually get back from my coffee run by then.


So ... 🥴


Display keeps turning off after 30 seconds no matter what the settings say.

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