Trouble "Putting Display to Sleep"

Thank you, Ironical-Suburb

Searching the Web, I found this article that works.

How to fix Hot Corners issues

By Serhat Kurt Posted on December 13, 2021.

https://macreports.com/hot-corners-not-working-on-mac-fix/

 "I found solution number one to be the simplest and the most effective."

Solution 1.

If you are having issues with Hot Corners after setting up, the following steps may help you fix it. 

Turn off, restart, and turn on 

The first step I recommend is to follow this specific step:

On your Mac, choose Apple menu > System Preferences > Desktop & Screen Saver > Screen Saver, then click the Hot Corners button.

And turn off hot corners. For each corner, select the "-" option.

After your Mac turns on, again go back to System Preferences > Desktop & Screen Saver and enable Hot Corners.

Solution 2.

Kill the Dock

Some users who were having this hot corner problem told us

that restarting the Dock fixed the problem. You can do this as well. Follow these:

Open Terminal on your Mac (Applications > Utilities). In Terminal, enter the following command and hit enter:

killall Dock

The Dock will restart; this can fix the issue as well.

Solution 3.

Restart your Mac in Safe Mode. 

Safe Mode can be a good option to fix this Hot Corners feature. Safe Mode checks your startup disk. 

How you start your Mac in Safe Mode is slightly different on the Apple silicon Macs than it does on an Intel-based Mac. If you are unsure what your Mac type is, go to Apple menu > About This Mac > Overview. This screen will let you know your processor type. 

Solution 4.

Apple silicon Mac 

Turn off your Mac. Wait for your Mac to turn off. Press and hold the power button until the startup options screen appears.

Select your startup disk. 

Press and hold the Shift key and click "Continue in Safe Mode."

Log in to macOS. You may be asked to login more than once. This is normal. 

Solution 5.

Intel Mac:

Turn off your Mac. And make sure that your Mac is turned off.

Press the power button to turn on your Mac, and then immediately press and hold the Shift key.

Release the Shift key when you see the login screen. Login. 

Again, you may be asked twice to log in.

Now, your Mac is in Safe Mode. Does your problem occur in Safe Mode? Test your hot corners.

Restart your Mac; This will exit Safe Mode. Then, test to see if the hot corners are working again. 

Solution 5.

Reset NVRAM or PRAM 

If you are still having this issue, try this. Reset NVRAM or PRAM. You can reset this if your Mac is an Intel based device. Follow these steps: 

Turn off your Mac. 

Locate these keys: Option, Command, P, and R. (You will need to press them quickly after you turn on your Mac). Turn on your Mac and immediately press and hold the above keys for about 20 seconds. 

Your Mac will restart and release keys when you hear the second startup sound or when you see the Apple logo for the second time.

Your Mac will start up. 

Thank you, junaidjabbar,

Yes, I'm left with what you suggested.

–Resetting hot corners seems to work, although only temporarily.

–Checking the Activity Monitor, I see that no background apps except Apple's required apps are working.

–If I use ctrl + cmd + q, the program stops, and the computer stops asking me to log in again.

–If I close the computers cover, the 3d program stops.

–if I go to the Apple menu (top right Apple icon) and select sleep, the program stops.

As I mention earlier:

"When old code competes with new code," it often creates a complex and challenging situation for developers.

Technical Debt: Legacy code (old code) often comes with technical debt, which refers to the implied cost of additional rework caused by choosing an easy solution now instead of using a better approach that would take longer.

Thank you, Legendarioid,

I can't help but thinking of Fred Flintstone putting his foot through the floorboard to move along.

"When old code competes with new code," it often creates a complex and challenging situation for developers. Here are some key points to consider:

Legacy Code: Old code, often referred to as legacy code, has been battle-tested and proven to work in real-world scenarios. It has undergone numerous bug fixes and optimizations over time.

New Code: New code might be written using modern practices and technologies, potentially making it more efficient and easier to maintain. However, it hasn't been tested as extensively as legacy code.

Integration Challenges: Integrating new code with old code can be tricky. The old code might not have been designed with modern practices in mind, leading to compatibility issues.

Refactoring: Sometimes, refactoring old code to improve its structure and readability can be a better approach than rewriting it from scratch. This allows developers to retain the proven functionality of the old code while making it easier to maintain and extend.

Technical Debt: Legacy code often comes with technical debt, which refers to the implied cost of additional rework caused by choosing an easy solution now instead of using a better approach that would take longer.