Mac Mini (M1) dual display doesn't work.

Are both monitors set to 4K (3840 x 2160)? Mine will only retain settings at 2K (2560x1440), although they work fine at 4K as long as they aren’t allowed to sleep. Mac Mini M1 upgraded to 11.1 beta3.

Sadly I don't think it was even fixed in 11.1, I think it was fixed in 11.0.1 build 20B50, at least it was fixed for me.

In any case, I am returning mine because it still has another issue which may be hardware, unresolved by these recent updates. :(

Good luck you guys. :)

BigSur 11.1 only solves the flickering issue.

In this update, the resolution on my 2nd monitor is still out of sync and the top horizontal menu bar moved out of the display that I could not select the menu. I switched the cable back to the HDMI->DVI cable and things went back to normal and the resolution on both monitors are correct at 1920x1080.

AH man. The update NOT fix my problem. Bummer. It did change it a little bit tho. Throughout today, I've had the mini forget the resolution of my monitor and refuse to any higher than 1024x768, screen was just black and unrecognized after sleep, and random pink blocks.

Same as before: simple unplug and re-plug fixes the problem.

Now I call apple. BUMMER!

I have an M1 Mini too. I have an old LG 27" screen with HDMI and DVI. With an HDMI to DVI cable, video doesn't work at all, just completely blank. I have a USB-C to HDMI adapter, and with that the same cable to the same monitor works, except that it will not wake from sleep – I have to unplug the adaptor (not just the monitor) and replug it for it to wake up.

On the same monitor with an HDMI to HDMI cable it works for a few minutes, then starts breaking up and eventually loses picture and sound altogether, though I'm pretty sure this is a monitor issue.

A projector connected directly to HDMI shows a picture, but it's very distorted, showing an overbright interlace-style pattern with a pink and green tint, though you can make out the desktop. Running the same projector & cable through the USB-C adaptor works fine, though I've not tested if it wakes from sleep with that.

I've updated to 11.1 and all issues remain.

I updated to 11.1, even did another OS reinstall after the update. Problem persists. Called in to apple tech today, got escalated to level 2 tech. Did the screen share thing with them and I was able to reproduce the problem. I even showed them this thread. They recored my screen, took notes and we scheduled a phone call for this Saturday. She told me it's better when everyone having the problem calls in to apple to make them away and possibly get a faster fix. So yeah, you should probably visit apple support and schedule a call so they can call you back.

Same for me. I made the mistake of changing the orientation of one of my monitors to portrait and then back again. Now whenever it restarts, it restarts in the old orientation (even though it was reset to landscape). The problem is that the other monitor is not the primary (can you change this), so every time I restart I have to try and navigate to the password in the wrong orientation. I am new to Apple and must say that I think this is poor. I know that you guys are notoriously loyal, but your willingness to spend money on adapters to fix an issue that should not be there, amazes me.

Just to be perfectly clear here... this really is a first generation M1 Mac computer. It is expected to have issues. It is also really a first generation OS for said device (Big Sur), so it too, is expected to have issues.

Not trying to say Apple shouldn't have tested the devices more before actually releasing either, just pointing out that when you are buying a first generation anything, you are basically buying a device with many unknowns attached to it. It's not the same as buying one of their INTEL Mac computers which have over a decade of iterations under the belt.

Many of the try this and try that adapter merry go round has been more an effort on the user's part to try and get a device to work as expected on an INTEL Mac... come to find out, many of the issues had to be fixed in Big Sur by Apple. So it was never the cable or the adapter for many... it was the OS. It may still turn out to be a limitation with how the hardware was implemented for others. Whether that means Apple is going to fix it in the next iteration of M1 type Macs or do some sort of return, we don't know yet.

The reality is, everything that went wrong with those who adopted the M1 Macs early, is a wealth of information and knowledge for Apple to use for improving the device. The devices will only get better. It's a painful road for the early adopters, but a year or two, these things are going to be much better than they are today because of early adopters.

You're all pioneers. And as pioneers, you get to be the first to own one and help with the molding of it's future with every little thing you learn about it along the way. Apple can't possibly test every possible piece of hardware that can be attached to it, nor can it test how people will use it... that's where you all come in. We all come in. We are the world's largest test group in the world... it's like we make up the super-computer of testing... we have the ability to find things that Apple didn't in less time than it would have taken them to find them.

Apple certainly didn't attempt to connect 6 displays to an M1 Mac... but some intrepid M1 pioneer did. Just saying you are all pioneers at this point. The safety net is in the INTEL Mac lineup because over a decade of pioneering has made them pretty **** stable/predictable... and it is that history that has a loyal Mac base behind it. The M1s are going t get there... just not right out of the gate.

Ape Menu>System Preferences>Displays>Arrangement Tab

The blue rectangle (screen) with the white bar on top is the Primary Screen. You can drag the white bar to the blue rectangle you want to make primary.

For me, if resolutions of monitors are not remembered/retained upon wake then the assigned primary monitor is not remembered either. For now two 4K monitors running at 1080 resolutions allows Mac to remember all settings after wake. Not ideal but better than before.

I understand your point, but all it does is to show that Apple philosophy is broken. Costumers can't be their guinea pigs. It is understandable in situation like the first iPhone, but not in this case (although the processor is innovative, the bug was in the OS, a product that have existed for decades now). The change in philosophy is damaging the company. As a developer they drive me crazy, changing everything every single year. Things that worked for years stop working or are buggy because they keep changing everything every year, non stop. You can see how that philosophy changed on the consumer side as well by looking at the number of devices they have for sale. It is a mess. Several computers, ipads, iphones, watches, speakers. Even the TV service is confusing (I still don't know if Apple TV is Apple TV+ or what). One of the things Steve Jobs did was to reduce the product line, and all they did since Steve is gone is to add more and more products (all the same, just different models). I hope they change soon, because a lot of people is leaving the platform. Now I have a computer for a few more years, but after this frustrating experience with my new Mac mini I doubt my next computer is going to be Apple.

Wiping my drive clean entirely (deleting the partitions and creating a new one) and reinstalling the OS is what solved this issue for me. It was running fine on 11.0.1 after I did that.

Unfortunately I had other graphics issues (pink , white and gray artifacts) so i returned it today.

Since this is my work computer I don’t have time to deal with it, but will follow the threads and see when these issues resolve, and I’ll re-purchase them. The machine, without the issues, is otherwise amazing.

If I use two HDMI cables, it would not work for me, even with the lastest patch. But if I use one HDMI and one DVI, it works fine. I settled for this as of now.

Even though we like Apple products and some of us are willing to be guinea pigs, if that's the word, I still think that at the end of the day, we are consumers and we paid for a product or service.

Please do share what is said. I fear it is a hardware issue. If it were software... the update would have fixed it. I have the return label printed out. Will wait for the word from the apple Tech. I still have my 16GB in the box. Not opening until I see a resolution. I have the 8gb - and the two monitor situation was bad. I have not had the chance to recheck with the 11.1 update.