M1 Mac Mini, Displays wont turn on after wake from sleep

Across a variety of forums, a common thread seems to be problems with USB-C to DisplayPort. Even though I have a USB-C capable monitor, I went with HDMI to HDMI so I could keep the USB-C open for other uses and the HDMI handles 4k 60hz, so why not.

Regarding Bluetooth issues, I have seen it mentioned that problems were averted by unplugging everything from the USB-A ports. As if interference is resulting from badly shielded connectors, cables, etc. Can’t speak to that solution other than to say that I have nothing plugged into either of my two ports and I am having ( knock on wood) zero issues with Bluetooth. So, maybe there is something to it.

Same problem, while I wake up my mac which connects an external monitor by clicking Bluetooth mouse, my USB keyboard has no power. Just to note that I just switch from an Intel-based Mac, it not a problem for the previous model.

I have a similar issue, but not exactly the same.

So far, the new M1 mini seems to 'forget' it's screen configuration and try to figure out what's happening from scratch every time it 'wakes'.

The M1 does not seem to sleep in the same way as the Intel macs - that's probably related to the issues I've been seeing.

I read through this thread, and I admit - it's frustrating to see the 'apologists' pile on and defend Apple out of the gate. Clearly, they have made some substantial changes here to this new model and it's most certainly affecting the user experience. Let's not get into 'hey - you're just holding it wrong' mode. There's a lot of complexity in monitor configuration that works, and that does not work well with this model.

My setup is I like to share the desk with 2 other machines - so I have a HDMI switcher and a power bar that senses power draw from one monitor, and when that first monitor powers up, the other one gets power from the system. It's complicated, but it typically works pretty well. What I've been finding is sometimes the Mac can manage to wake the monitor, and sometimes it can't. I happen to have another device in sleep mode on my desk, and when I toggle that, the mac finds the second monitor, and eventually then finds the first.

I also am using a lenovo thunderbolt 3 dock for one of the HDMI monitors. It's generally working really well - but the odd time this dock does need to be unplugged and plugged back in when switching things around a lot.

The reality is - this is a desktop - and users will expect it to run a myriad of configurations well and without issue.

Also - I have been running into the flickering issue after a 'sleep' cycle. Only cure for that so far is a restart.

I'm still experimenting with the sleep settings and I will re-post any work arounds for monitors and I encourage others to do the same. Thanks for sharing!

The M1 Macs have a completely new restart system. You have to hold the Power button down until it enters "startup mode". It'll show "loading startup options" and then there's a whole new system of menus and options.

https://eclecticlight.co/2020/11/28/startup-modes-for-m1-macs/

I am having the same issue, is this going to get resolved. I literally had this mac mini m1 for less then 5 hours. Every time it sleeps it restarts or the screen doesn't turn back on. Very disappointed with this purchase!

I have had this issue as well. After rebooting and removing a USB C Hub with and HDMI port (into which nothing was plugged it), I haven't had that issue. However, as I type this, the video jitters and cuts out for a second at a time. I'm using a Samsung U32J59x 32" display via DisplayPort. I notice that tapping the desk with my fingers causes the machine to move, which causes the jittering. It's like the display cable doesn't seat tightly in the Mac mini's female port. Never had that particular issue in my 2018 Mac mini.

I was using a usb-c to display port adapter. What resolved my issue was just using the HDMI out port on the MacMini. Not my first choice, but pretty much my option at this point. I also had a usb-c to HDMI usb-a hub and could not connect through HDMI on that, which I preferred for the additional cable length I got to the monitor. I can definitely say this M1 performance wise has been amazing (over intel) other than the notorious wake from sleep issue Apple has yet to resolve after so many years.

I'm having this exact same problem. Every time i wake up the Mac, I have to go into monitors and rearrange the monitors. I've even tried to just swap which port the monitors are connected to to avoid this, but it didn't work. The monitors down always come on, sometimes they come on in the wrong positions, sometimes it comes on as mirrored. I've tried messing with resolutions, but no help. This is on an M1 Mac mini that I have had for two days. One monitor connected to HDMI, and another to USB-C with an adapter to HDMI. Both monitors are the exact same, Samsung 22 inch monitors. The monitors also blink when trying to wake up, and my desktop pictures keep flashing while this is going on, until I can get both monitors working again. This is incredibly frustrating, especially since this is a brand new computer, with one brand new monitor, and the other monitor only months old.

Just so everyone knows, I just called Apple Support today (12/13/20) for my two-day old M1 Mini that was having this problem. The person said that Apple is aware, many are having this problem, and that it should be fixed in a software update once they can solve it.

Great find. Hopefully others can benefit from the info. Additionally, I continue to see posts from folks experiencing problems when using conversion cables. USC-C to DisplayPort, USB-C to DVI, etc.

I was happy when pressing a key brought my monitor to life. Even better, I discovered yesterday that moving my mouse was now triggering the system to wake up as well. It wouldn't do that with a wire mouse and now it is working with Bluetooth.

Installed the update, and so far, everything works perfectly. Wake from sleep has worked perfectly so far. I've tried to trip it up, but so far, so good. I DID have to go back into Sys Prefs to fix monitor arrangement after install, but everything has worked fine after that first restart so far.

macOS 11.1 has fixed the issue for me. I am able to bring back display from sleep and from power off (both of which didn't work previously). Using USB-C Digital AV Multiport Adapter to connect to LG 4k 60hz monitor over HDMI.

Well, it seems I may have spoken too soon. While the wake-from-sleep problem has gotten much, much better, it is still happening on occasion, and as Pearsnet stated, it won't even recognize my second monitor, and I have to restart.

I guess I will try the "separate spaces" hack mentioned above. I never used different spaces until after reading this thread, so it could very well be connected to the spaces. I guess we'll see.

Same sleep (and the bluetooth) issue with my Mini M1 connected to a Dell UltraSharp 38 monitor. I have neither issue w my MacBook Pro or the Mac Mini (intel) my M1 replaced.

Yup looks like the common theme is usc-c (Mac) to DP (monitor) which I was using as well. I just switched to hdmi to hdmi and no issues but it's only been part of a day. Thought about USB-C to USB-C but as you mentioned would like to keep the USB-C's open (have an ext ssd on the way)

Was hoping the recent 11.1 update would have fixed the separate bluetooth issue but it didn't. Good luck!