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

Interesting.. I also tried USB-C -> HDMI cable, not an adapter but no luck.

Just FYI, I tried this cable and used with monitor which has 2560x1440. Did not work.

https://www.amazon.co.jp/gp/product/B0816DTXPK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

I hope your new adapter will fix the issue!

This issue is super annoying but once I started using the adaptor I bought, It is very stable and had zero issue so far. Hope your adapter will bring the same result!!

Not that I ordered a DisplayLink last week and have tried multiple cable configurations without anything helping.

As I write, my mini is installing Big Sur 11.2 beta 2, so I'm curious if there will be a fix in it.

Over the last few days, the flashing/black monitor issue has stopped for me. I didn't change anything about my setup at all, that part of the issue just stopped. I still have to rearrange my monitors on log-in, though.

So, interesting... I have seen the USB-C to HDMI adapter screen go off each time I have logged off even after doing the Big Sur reload, then starting in disk start up options and re running Big Sur... every time after the re load of the re running of the OS, I get the screens, then I either shut down or allow it to go to sleep, and the USB-C to HDMI does not work. HDMI to HDMI works, always has. Well... interesting tonight. I walked away to cook, watch Blacklist, and eat, and the HDMI to HDMI went into the koosh ball screen saver. By the time I came over, both my monitors were in sleep mode. I moved my mouse to wake up Mac mini... and I am typing as I writer on the USB-C to HDMI monitor and the HDMI to HDMI monitor is on and working. I know when I close this down tonight, it will not work, but this is just odd. I do not want a computer I can't consistently rely on the displays working. This is beyond frustrating.

Meaning, advertised that their own products don't work. There should be a solution when you call Apple Care as well.. they want to replace my unit. At first they wanted me to send it in or go to the store... heck no... I just got it last night. Should have waited, I want to be able to use this out of the box, not have to sink another $300 into accessories. I get that we have to buy a mouse, and keyboard, but then something else to run dual displays. I don't have to do this with my MacBook Pro.

I won't be restoring from backup, I'll just reinstall all my apps fresh again. Please do let us know how it goes with the replacement Mini. I have a nagging suspicion that these are software problems and not hardware problems. If the problem persists on your new mini, I'm going to cancel my order and just deal with the Mini I have.

*fingers crossed*

Dude, those instructions are a little too hard for me. Run a ruby script to create an override file? Can some one just tell me what to copy and paste into terminal? Someone needs to create some easy to read instructions that even a musician could understand. (I'm a musician).

Give me some easy instructions of what to paste into terminal I can do it! I'd love to try it!!!

thx

I have a USB-C to HDMI cable going to one monitor, and HDMI to HDMI going to the other monitor. This is fantastic news. Please let me know if your other issues are resolved as well!

Happy Day!

[Edited by Moderator]

ruahusker2: Hey man, do you think I should cancel my order for a replacement Mac mini M1? This display issue is the only problem I've had with it. If it looks like it's going to be resolved with 11.1, I can just wait for the system update, rather than buying another one, returning this one, deal with refunds and all that.

Yea... I ran into the same issue. The setup ran perfect on the Mini i3, I switched to the M1, and then one monitor was not recognized. I tried reversing cables, using single, and got intermittent flickering and even full loss of one screen. No time for this - Machines should not be going out with this issue. Sending my machine back. Good luck.

I do not have an M1 but historically Apple computers cannot boot from a system that is earlier than the system they were delivered with so I would not expect Catalina to be able to boot an M1 that was delivered with big sir.

I'm having this same exact issue, as well as some other issues that others have mentioned in my research. Mostly pink artifacts, mostly first few minutes of startup. Once my Spotlight searches stopped working, and another time I had to reboot for USB to work.

The consistent issue though, has been this dual monitor issue, which matches the OP's description to a "T".

So you are using only the usb-c port of the mac mini and you have bought a splitter adapter with one side a vga output and one side of the adapter has hdmi? (Basically avoiding to use the HDMI port on the mac mini?)

mattd313 wrote:

Mine after I re-installed the OS is 20B50... I didn't check it before. What is yours?

Looks to be 20B29. That's still the factory build, as in I unboxed it and immediately had an update because it was only running 11.0. So it does sound like something's different with the reinstall!