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The most likely issue here is the monitor/tv is not reporting it's capabilities to the mac, so macos sets it to a generic YCbCr tv mode which results in gray-ish blacks, fuzzy text, and missing resolutions. This can be fixed in a few steps.


1. Disconnect all monitors except the problem monitor. If you're on a macbook, close the lid and use only the external monitor.

2. Download patch-edid.rb from https://gist.github.com/adaugherity/7435890 ("Download ZIP" link on the right side) and unzip the file. Copy the patch-edid.rb file to your user/home directory.

3. Open Terminal and type ruby patch-edid.rb. This will create a new directory in your user/home folder. Mine was named DisplayVendorID-593a. Yours will have a different number.

4. Copy that directory to <your mac hard drive>/Library/Displays/Contents/Resources/Overrides/ (you can use Finder to copy it).

5. Reboot.


What's happening here is when the mac encounters your unknown display, it will look in the "Overrides" directory for a matching ID file. It will now find the one that you just created and use it to set up proper resolutions and color spaces.

This will not always work for everybody because EDID monitor reporting is not consistent and all sorts of things can cause problems, from cables to adapters to screen settings. However if it works with Windows, it will probably work with macos.
Getting error "No display data found! Are any external displays connected?" in terminal on M1 mini.
 
But is your text clear in all circumstances? (Excel, amazon have been the two worst for me)
both amazon (with Safari) and excel are working totally fine. If I use the same monitor connected to MacBook Pro 2018 (intel) via usbc I see no difference
 
Getting error "No display data found! Are any external displays connected?" in terminal on M1 mini.
Something is preventing the mac from getting data from the monitor which would explain why it wasn't working properly in the first place. First thing to question is any adapters in use. They might be too old or simply wrong. Cables also come in all sorts of flavors. Early HDMI cables don't have the bandwidth to support 4K for example but it usually results in an intermittent flashing black screen. You will need to double check all the bits in the chain and make sure you are using what you think you are using.

EDIT: See my post below.
 
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I just want to state my experience using an Alienware 34" ultra wide...

The text is super choppy and blurry / aliasing when scrolling on almost any website or doc. (worse for docs since it's mostly black on white text).

If this is just the case for Mac mini's I'll probably return mine as I use it for school and mostly do lots of reading/research! I love everything about it... is it possible we see a fix?
 
I just want to state my experience using an Alienware 34" ultra wide...

The text is super choppy and blurry / aliasing when scrolling on almost any website or doc. (worse for docs since it's mostly black on white text).

If this is just the case for Mac mini's I'll probably return mine as I use it for school and mostly do lots of reading/research! I love everything about it... is it possible we see a fix?
What’s your connection and what does it list in About this Mac, system report, graphics?
 
What’s your connection and what does it list in About this Mac, system report, graphics?
usb-c to DP for connection. 3440 x 1440 @ 120hz. I actually just tested my normal PC and was experiencing similar issue.

Biggest difference is I can't get my normal PC above 50hz, but even when scrolling slower on my PC it had similar issues. thoughts?
 
2019 macbook pro here looks fine on ultrawide LG 1080P. i hope my new mac mini will be ok.. .has anyone fixed this?
 
This is concerning.

I am using a 16" MBP with a Samsung Ultrawide 46"

Single Thunderbolt 3 from MBP to CalDigit dock and then digital display connection to monitor.

Running in 5120x1440 @60HZ

Am I going to have display issues if I buy the new M1 Mac Mini with the same connection?
 
usb-c to DP for connection. 3440 x 1440 @ 120hz. I actually just tested my normal PC and was experiencing similar issue.

Biggest difference is I can't get my normal PC above 50hz, but even when scrolling slower on my PC it had similar issues. thoughts?

I would start with cables. Maybe try a good Thunderbolt cable and run it MM to your USB-C on the display, Might as well have a good HDMI cable to test as well.

Also I remember hooking my 2018 at first a few years back direct and I had aliasing when fast scrolling. I got rid of it and it has not come back. It was worse when running my monitor max Hz. It was best at 60 Hz. It’s not an issue now but it took some trouble shooting with cables and connections. That seems to be a MM thing, its not just plug and play like it should be.
 
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Hmmm... I have an M1 Mac Mini on order currently and I already have a Dell s3220dgf QHD monitor that I want to use with it. I'd like to connect it via HDMI to keep my 2 USB-C ports available for other things.

However my older Macs (2009 Mac Pro and 2010 Mac Mini) see the monitor as a TV and it maxes out at 1080p resolution. Holding the option key down still only shows up to 1080.

Will this be an issue with the current M1 Mini?
 
On both a regular and ultrawide 1440p monitor, the problem is the same. Text is jagged and unpleasant to read/scroll. Take a look at an article on a site like 9to5mac with thin white text on a black background - you’ll see what I mean. Same text on a PC is razor sharp. It’s down to how macOS now handles antialiasing.

My 2018 Mac mini is very temperamental both through HDMI and USB-C to Displayport (with an active cable) with my AOC ultrawide. Via HDMI, it can take several attempts and reboots before I get a picture. With DisplayPort, I get nothing at all - black screen. Both are fine on my PC.
 
I did try a couple different cables.

So are 1440p monitors unfortunately plagued with this issue? I'm still in the return window for mine, I love the monitor but honestly don't want to pay what I did only to be stuck with aliasing this bad.

Does anyone have a recommendation on a 4k monitor? I primarily use this for productivity and loved the idea of having 3 windows open side by side.
 
Hello to all. I can confirm that the new Mac M1s have problems with handling ultra-wide displays. I have a LG 5K 34WK95U (max resolution 5120x2160) and it doesn't work well. The maximum resolution I have is 3440x1440.Obviously the user interface is bad, everything is blurry. The same display with a 2016 MacBook Pro touchbar works flawlessly using Big Sur. In conclusion it is not a problem of the Big Sur but of the new M1.
Instead with an external 4k display (16:9) it's working perfectly in HiDPI.
 
Hello to all. I can confirm that the new Mac M1s have problems with handling ultra-wide displays. I have a LG 5K 34WK95U (max resolution 5120x2160) and it doesn't work well. The maximum resolution I have is 3440x1440.Obviously the user interface is bad, everything is blurry. The same display with a 2016 MacBook Pro touchbar works flawlessly using Big Sur. In conclusion it is not a problem of the Big Sur but of the new M1.
Instead with an external 4k display (16:9) it's working perfectly in HiDPI.

When you say 2016 MBP I am assuming you mean the 16"

That makes perfect sense. Same thing for me.

You see, the 16" MBP has a separate video card (Radeon) which is necessary to drive a widescreen monitor.

The 13" Intel MBP can't do it properly because it has integrated graphics. So, of course, it stands to reason the M1 can't do it either as it has the same integrated limitations.
 
When you say 2016 MBP I am assuming you mean the 16"

That makes perfect sense. Same thing for me.

You see, the 16" MBP has a separate video card (Radeon) which is necessary to drive a widescreen monitor.

The 13" Intel MBP can't do it properly because it has integrated graphics. So, of course, it stands to reason the M1 can't do it either as it has the same integrated limitations.

sorry I mean the 13” macbook pro 2016 touchbar, the one with Intel Iris Graphics 550, so no separate video card.
I have this model and with the LG 5k ultrawide, it is working prefectly.
That’s why I wrote that it’s a problem present only with the new Mac M1.
 
sorry I mean the 13” macbook pro 2016 touchbar, the one with Intel Iris Graphics 550, so no separate video card.
I have this model and with the LG 5k ultrawide, it is working prefectly.
That’s why I wrote that it’s a problem present only with the new Mac M1.

I am sorry. I misread you. I actually have 2019 13" MBP and I don't think that has a separate graphics card.

However, since your 2016 does, that is the reason you have no issues with your widescreen monitor.

So, again, it's pretty safe to assume you should not buy an M1 device at this time if you are going to use it with a widescreen display.
 
So I am using a iiyama G-Master GB3461WQSU-B1 Red Eagle with a resolution of 3440 x 1440px and just hooked up my base Mac mini M1 to it.

It will not put out the correct resolution, neither over HDMI nor through a Thunderbolt 3 Elgato Dock that can do HDMI 4K60. The resolution is limited to 800x600 as a native resolution. I tried two different HDMI High-Speed cables that had no problems in putting out 4K60 to other devices.

I tried different adapters to Display Port as well and the monitor seems to have issues with the Mac mini.

Anybody else tried any Ultra Wide monitors with their Mac mini yet and was successful?
I am using the same monitor and I am having the same issue unfortunately...
 
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