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

I’m afraid based on how long it took me to get to this point, I can’t take your word on it. SO, please post a snapshot confirming the settings mirror what I’ve posted please and confirm they will stay that way irrespective of whether you think that’s relevant or not.

And then add some detail on the two monitors - make & model would be perfect.

Jerry_D wrote:

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?

No the Mac does not go to sleep it simply is killing the signal to the display to prevent burn in. This is likely by design and I have the same thing in my set up using lock screen. There is zero to worry about and is actually a good thing. Unless you like having pixels being burned into the screen and your monitor burning energy for an image which likely no one is going to sit and stare at for hours.

Did you ever find a fix to this? I seem to have the same problem.

i have a Mac Studio and Mac Studio Display. When I lock my computer, the screen goes black after 20-30 seconds no matter what. If I let my screen idle for a minute, my screensaver comes on but it doesn’t follow the time settings that I configured. The monitor goes black in less than 10 minutes when I have it configured to run for 30.

tonight I updated the latest sonoma version and I am also experiencing the same issue in my Mac mini. I have set the display turn off setting for 2 hrs but after 30 sec it is getting turn off on Lock Screen. it is very weird and it's a bug. @appplesupport kindly check and fix it.

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?

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.

Thanks never tried that Ctrl+Cmd+Q to lock screen, my iMac running Mojave goes to the Lock Scren & tuns plack in about 5 seconds!:)

All windows come back where & how they were, but in Mission Control I have nothing checked & no external Monitor.

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 ... 🥴

Use the settings shown here Wake up a remote Mac mini - Apple Community, might fix.

Er, no. Don’t care about Lock Screen. Please post snapshots referring to the settings shown here Wake up a remote Mac mini - Apple Community.

Post snapshots please of how it is now.