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M1 Mac mini not waking display after sleep

Okay... that seems to have fixed my waking from sleep issue... many thanks.

Now I really need to get my old display back, I have to have a glass screen!
 
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Ah... it's come back, also I notice the USB has stopped working, so no input from keyboard or mouse!

I have to reconnect the USB and that usually works.

Oh brother - not happy.
 
I'm amazed that these problems persist as they all seem like software issues. Apple should be more aggressive about diagnosing and fixing these.

I have absolutely no problems with my M1 mini - hooked up to dual 4k monitors and two USB hubs with about 8 devices attached (external SSD, Time Machine, mouse, keyboard, USB flashlight, Lightening cables for charging mobile devices and even a 30-pin cable for charging my iPad 2. It took a while to get here as I had issues with some cables but things are stable.
 
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PhillipD said:
I too also have this problem. I have an M1 Mac Mini and a Dell U2718Q. I have it connected currently via USB-C - Display Port. To force it to wake up I disconnect the USB-C connector and connect it back.

Phill
Click to expand...
Have had exactly the same problems with my Mac mini 2016.
I got myself a new monitor, Dell.
This one worked without problems for years and I thought it was the monitor.

Then, all of a sudden, it started again, 06.2022.
Got me all the cables and different monitors....In the end, it was a simple swap of the outlet.

Believe me, I have been dealing with this problem for 6 years and since the problem reappeared June 2022 investigated again.
Constantly you let, Apple knows and wants to take care of it. Nowhere on the net I have found solutions.
Never would I have thought that it could be due to this. So try it out with pleasure, I hope very much that you can solve the problem with it.
 
I have an M1 mini hooked up to a Dell U2720Q via an 18-inch USB-C cable and it sends the display signal and takes care of several USB devices. No problems with sleep. I have had it hooked up to a pair of Dell U2718Q monitors in the past and had problems but I bought better cables and didn't see the sleep or black screen problems afterwards.
 
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gooimac said:
My M1 (8gb/256) Mac mini doesn't seem to want to wake my displays after its been sleeping. I have tried with 2 different displays with 2 different HDMI cables with the same thing occurring on each one. I am currently only using one at a time. I also noticed some pink squares/graphics glitches on the Big Sur boot/log in screen (with the coloured background, not the black and white boot up)

I am going to leave it with the display set to never sleep for now to see if anything is different after leaving it for a while.

Any one else having similar issues? I don't have a USB-C to HDMI or DisplayPort to try currently.
Click to expand...
Hi,

There is a simple solution to this problem
Goto to the menubar Apple->Sleep after moving the mouse or press a key the screen will awake
If the menu is on the HDMI screen use the shortcut Shift-Ctrl-Cmd-Eject after moving the mouse or press a key the screen will awake
 
gooimac said:
My M1 (8gb/256) Mac mini doesn't seem to want to wake my displays after its been sleeping. I have tried with 2 different displays with 2 different HDMI cables with the same thing occurring on each one. I am currently only using one at a time. I also noticed some pink squares/graphics glitches on the Big Sur boot/log in screen (with the coloured background, not the black and white boot up)

I am going to leave it with the display set to never sleep for now to see if anything is different after leaving it for a while.

Any one else having similar issues? I don't have a USB-C to HDMI or DisplayPort to try currently.
Click to expand...
Hi,

There is a simple solution to this problem
Somehow there is a difference between putting a HDMI display timebased to sleep and directly using sleep
To solve this put the mac mini directly to sleep
Goto to the menubar Apple->Sleep after moving the mouse or press a key the screen will awake
If the menu is on the HDMI screen use the shortcut Alt-Cmd-Eject after moving the mouse or press a key the screen will awake
 
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Sloatpro said:
Hi,

There is a simple solution to this problem
Goto to the menubar Apple->Sleep after moving the mouse or press a key the screen will awake
If the menu is on the HDMI screen use the shortcut Shift-Ctrl-Cmd-Eject after moving the mouse or press a key the screen will awake
Click to expand...
I think you have missed the point of this thread,

Doh!
 
Sloatpro said:
No I didn't miss it. Somehow there is a difference between putting a HDMI display timebased to sleep and directly using sleep
Click to expand...
Okay...I've never scheduled sleep on my mac - I just press sleep from the apple menu.

Will not wake the display on mouse press or keyboard.

I'm thinking it may be a USB issue.

So...?

To be continued...
 
I hate this damn bug. It's been driving me crazy for a couple of years now. I've tried everything, even the solution mentioned by dbrewood. Tried multiple monitors. Nothing works. Unfortunately my monitors don't have displayport, just HDMI so I can't try USB to displayport. Getting tired of having to do a hard shutdown. Might just disable sleep permanently. Can't believe Apple can't fix this after all this time.
 
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Todd H said:
I hate this damn bug. It's been driving me crazy for a couple of years now. I've tried everything, even the solution mentioned by dbrewood. Tried multiple monitors. Nothing works. Unfortunately my monitors don't have displayport, just HDMI so I can't try USB to displayport. Getting tired of having to do a hard shutdown. Might just disable sleep permanently. Can't believe Apple can't fix this after all this time.
Click to expand...
Agreed... bloody Macs.
 
I also have this problem when changing inputs. I have an Xbox and a PS5 connected to the same monitor as the Mac Mini. When switching back from the Xbox or PS5 the display often will report "no signal." I've had this problem on multiple monitors/TVs and multiple Mac Minis over the years. Would love to be able to put this one in the rearview mirror.
 
So, it’s not just me then. With my Mac Mini M1, I personally don’t think it ‘sleeps’. Yes, the monitor goes off after 20 or 30 minutes (don’t remember the exact timeframe). But…
 
Likely it doesn't sleep which I can live with I guess. I have turned off hard drive sleeping.

HDMI 2.1 may help but as my monitor is 8-9 years old it is not aware of the increase in standards. :)
 
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