Mac mini 2018 and M4 Pro not waking monitor after sleep

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Level 1

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Mac mini 2018 and M4 Pro not waking monitor after sleep

Since Sonoma the 2018 has had intermittent failure of waking the monitor after sleep. Key presses, mouse or trackpad clicks do not revive the monitor. Even connecting the magic keyboard, magic mouse or trackpad doesn't work. I also tried connecting an old Windows USB keyboard and mouse and it still didn't work. Neither does restarting the monitor, it says "No HDMI signal" and sleeps again. A forced shutdown, using the power button, is the only way to get the monitor to wake.

The above also happens with the M4 Pro, however I have a monitor which works after it is restarted. I guess it is sending a signal back to the HDMI to tell it that "I'm on."

Since upgrading to Sequoia 15.3 every sleep on the M4 is failing to wake the monitor and I have to restart the monitor for this Mac mini. The 2018 is still intermittent for waking the monitor fails.

What's happening? It can't be just me!

Mac mini, macOS 15.3

Posted on Jan 29, 2025 04:31 AM

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Answer 1

hcsitas

Level 6

13,958 points

Jan 29, 2025 07:24 AM in response to fromdelsmac

Sleep is unnecessary on later Macs and should be disabled. Shut for long absences/idle overnights (no downside whatsoever) and for regular operation use the settings exactly as shown below: (reboot after setting):

Also, do not manual-sleep for brief absences; use instead the Lock Screen settings to switch the display off on timer:

Once set, you can also use Control-Command-Q to immediately lock your screen (instead of waiting for the display to switch off on timer).

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Mac mini 2018 and M4 Pro not waking monitor after sleep

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