Mac Studio not able to wake up a monitor from sleep

Hello Jayjaysongson,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with your Mac not waking as expected. Try the steps listed here to see if they resolve the issue: If your Mac sleeps or wakes unexpectedly - Apple Support

"If your Mac doesn’t go to sleep when you expect it to, or if it wakes up unexpectedly, you may need to change your sleep settings. If that doesn’t work, something may be waking your Mac. 

Check your system’s sleep settings

Make sure the sleep settings are set the way you want.

1. On your Mac, choose Apple menu  > System Settings, then click Lock Screen  in the sidebar. (You may need to scroll down.)
2. To set the amount of time that should pass before your computer goes to sleep, do one of the following:

• Click the “Turn display off on battery when inactive” pop-up menu on the right, then choose an option.
• Click the “Turn display off on power adapter when inactive” pop-up menu on the right, then choose an option.

You can also turn off “Prevent automatic sleeping on power adapter when the display is off” in Displays settings.

Check your system’s network access setting

Other users may be waking your Mac remotely to use its shared resources. If you don’t want this to happen, choose Apple menu  > System Settings, then do one of the following:

• If you’re using a Mac notebook computer: Click Battery  in the sidebar (you may need to scroll down), then click Options on the right. Click the pop-up menu next to “Wake for network access,” then choose Never.
• If you’re using a Mac desktop computer: Click Energy Saver  in the sidebar (you may need to scroll down), then turn off “Wake for network access” on the right.
• Check your system’s sharing settings
• People using shared services on your Mac can prevent it from sleeping. For example, they may be using a printer connected to your Mac or accessing shared files stored on it. If you don’t want this to happen, you can turn off any services you don’t need to use.

1. On your Mac, choose Apple menu  > System Settings, click General  in the sidebar, then click Sharing  on the right. (You may need to scroll down.)
2. Turn off the service you don’t need to use.

• Check your system’s activity
• Processes running in the background can prevent your Mac from sleeping. Check Activity Monitor to see if a process is unexpectedly using your Mac computer’s central processing unit (CPU).

1. Open a Finder window, then go to Applications >Utilities > Activity Monitor.
2. Click the CPU button at the top.

• Check the software or SMC
  • Update macOS: Certain software issues can be resolved by keeping your software up to date. See the Apple Support article Update macOS on Mac.
  • Use safe mode: Safe mode can help you to determine whether an issue is caused by software that loads as your Mac starts up. See the Apple Support article How to use safe mode on your Mac.
  • Reset the SMC: Resetting the system management controller (SMC) can resolve certain issues related to power. If you have a Mac with Apple silicon, just restart your computer. For other Mac computers, see the Apple Support article How to reset the SMC of your Mac.
• Check to see if something else is waking your Mac
• Check any of the following:
  • Unexpected keyboard presses or mouse and trackpad clicks: Key presses and mouse or trackpad clicks can wake your Mac. If your Mac wakes when you’re not present, something may be pressing the trackpad or mouse button, or keyboard keys.
  • Apps: Apps that access a disk can keep your Mac from going to sleep. For example, Music accesses your disk to read the songs it plays, and DVD Player accesses the optical disc drive to play movies.
  • Spotlight indexing: If Spotlight is indexing your hard disk, your Mac won’t go to sleep. Open Spotlight  to see if it’s indexing. Indexing can take several hours, depending on the number of files on your Mac.
  • Connected storage and devices: Malfunctioning USB and Thunderbolt storage and devices may keep your Mac from going to sleep. Disconnect those devices and see if your Mac goes to sleep. If it does, reconnect each item, one at a time, until you find the one that’s malfunctioning. Contact that device’s manufacturer for more information."

We hope this helps.

Cheers!

to get a Mac display to become active, you need the Mac to query the display, and the display to answer with its name and capabilities. Otherwise, the display will not be shown as present, and no data will be sent to the display. "No signal detected" is generated by the DISPLAY, not by the Mac.

This query is only sent at certain times:

• at startup

• at wake from sleep — so momentarily sleeping and waking your Mac may work

• at insertion of the Mac-end of the display-cable, provided everything on that cable is ready-to-go

• hold the Option key while you click on the (Detect Display) button that will appear in Displays preferences (from another display)

so try doing some of those things and see if the display comes alive.