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Level 1

10 points

Mac mini M1 has no signal for external monitor after waked up

Mini M1 with Big Sur 11.2.3 (20D91), Dell u2720 has no signal after waked up from asleep via HDMI to HDMI

Mac mini, macOS 11.2

Posted on Mar 29, 2021 1:31 PM

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Similar questions

7 replies

Mar 29, 2021 6:32 PM in response to Qzi

I am having the same issue with my brand new Mac mini M1. I have tried display port cable and thunderbolt cable but when the unit wakes from sleep no picture comes up. Only fix is to pull thunderbolt cable out and plug back in. I had the hardware in to the apple store. They checked everything and even reinstalled all software but the issue won't stop.

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Level 1

10 points

Mar 30, 2021 11:09 AM in response to simplevisionary

I also talked with the apple senior advisor, they advise me to reinstall the mac to isolate the root cause, wasting fo time, I rejected it.

thunderbolt cable performs better than HDMI, but still not perfect

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Level 6

12,692 points

Mar 29, 2021 9:22 PM in response to simplevisionary

Disable sleep, not needed for the M1.

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Level 1

10 points

Mar 30, 2021 11:10 AM in response to hcsitas

do you means that the setting:

Energy Saver -> Prevent computer from sleeping automatically when the display is off

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Level 6

12,692 points

Mar 30, 2021 11:12 AM in response to Qzi

Yes, check it.

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Level 1

10 points

Mar 30, 2021 11:15 AM in response to hcsitas

I am thinking that why you think M1 need to sleep when it's idle ?

but actually I checked this feature before, the problem was still there.

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Level 6

12,692 points

Mar 30, 2021 11:17 AM in response to Qzi

Keep it checked, nothing to lose.

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Mac mini M1 has no signal for external monitor after waked up

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