Mac mini M1 Ultra Wide Monitor Issues

[mwa3aan]

Here are a couple of points:
- The scripts that used to work on Intel macs that created custom display resolutions don't work on Macs with M1. The reason is the device architecture changed. These scripts used grep to search the ioregistry for display string identifiers such as 'IODisplayEDID'. That changed with the M1 and is now under new keys such as armio and disp0. Thats why using these scripts on an M1 based mac results in override config files with no verndor ids. I dont have a solution for this yet.
- Secondly, in post 53 your refer to switching to displayport 1.2 on your screen. That will fix the situation with the LG 5k2k screen if you use thunderbolt. It works for now, but is in reality a bug. The M1 macbooks and mini supports displayport 1.4 and the LG 5k2k also supports 1.4 natively. Unfortunately it maxes out at an HiDPI of 3008x1269, which renders in HiDPI and is crystal clear, but the monitor is capable of much more. It can actually render HiDPI of 3360x1417 which is also crisp and clear and the perfect resolution for this monitor. Intel based Macs will show this as an option but the M1 doesn't and you cannot force it with a custom script because OSX doesn't honor the overrides on an M1 mac (as per the bullet above)
- In post 58 you mention using a USB C 3.1 cable. USB C 3.1 alone has no ability to drive displays without the cable supporting Thunderbolt or terminating in a displayport. The screen end of the cable needs to connect using either Thunderbolt (on a display that supports Thunderbolt) or a normal Displayport. Thunderbolt over USB C ports or DisplayPort over USB C ports can drive displays. In the case of the LG 5K2K you can use displayport 1.4 (which can carry more data for theoretical higher HiDPI) if you use a USB C to Displayport 1.4 cable. I will link to one below. That cable will allow the Mac mini to connect to the LG 5k2k using displayport 1.4. I verified that this works. Thunderbolt over USB C should allow you to use DP 1.4 but wont currently work with MacOS Big Sur 11.01 on a Mac M1 and the LG 5k2k screen.

My recommendation would be to buy the USB C to Displayport cable. Please watch out. You get a 4K 60Hz one that wont drive Displayport 1.4. Buy the more expensive cable that can drive more than 4K (up to 8K 60Hz). Its worth the investment: https://www.amazon.com/gp/product/B01J6DT070/

Unfortunately, none of this helps with getting HiDPI resolutions that was possible before. Yet.

I hopes this helps a little while we try to figure out a solution for the M1 or Apple fixes this in future versions of MacOS Big Sur.

 

[The_Interloper]

I have found a solution for the jagged/poor quality text issues I previously mentioned on my 3440x1400 ultrawide - this should also work on any 1440p monitor with this problem. It uses the “How to Enable Font Smoothing in macOS Mojave by Terminal” tip on this page. In short, open up a Terminal window and copy/paste this command:

defaults write -g CGFontRenderingFontSmoothingDisabled -bool NO

Hit return then log out and back in. For me at least, text is significantly better and far more like what I would expect. You can also tweak the level of font smoothing with other commands on that page, but the above is more than acceptable to my eyes.

Although I did this on a 2018 Intel Mini, this should also work on an M1 as its a Big Sur issue.

 

[Lessig]

Here are a couple of points:
- The scripts that used to work on Intel macs that created custom display resolutions don't work on Macs with M1. The reason is the device architecture changed. These scripts used grep to search the ioregistry for display string identifiers such as 'IODisplayEDID'. That changed with the M1 and is now under new keys such as armio and disp0. Thats why using these scripts on an M1 based mac results in override config files with no verndor ids. I dont have a solution for this yet.
- Secondly, in post 53 your refer to switching to displayport 1.2 on your screen. That will fix the situation with the LG 5k2k screen if you use thunderbolt. It works for now, but is in reality a bug. The M1 macbooks and mini supports displayport 1.4 and the LG 5k2k also supports 1.4 natively. Unfortunately it maxes out at an HiDPI of 3008x1269, which renders in HiDPI and is crystal clear, but the monitor is capable of much more. It can actually render HiDPI of 3360x1417 which is also crisp and clear and the perfect resolution for this monitor. Intel based Macs will show this as an option but the M1 doesn't and you cannot force it with a custom script because OSX doesn't honor the overrides on an M1 mac (as per the bullet above)
- In post 58 you mention using a USB C 3.1 cable. USB C 3.1 alone has no ability to drive displays without the cable supporting Thunderbolt or terminating in a displayport. The screen end of the cable needs to connect using either Thunderbolt (on a display that supports Thunderbolt) or a normal Displayport. Thunderbolt over USB C ports or DisplayPort over USB C ports can drive displays. In the case of the LG 5K2K you can use displayport 1.4 (which can carry more data for theoretical higher HiDPI) if you use a USB C to Displayport 1.4 cable. I will link to one below. That cable will allow the Mac mini to connect to the LG 5k2k using displayport 1.4. I verified that this works. Thunderbolt over USB C should allow you to use DP 1.4 but wont currently work with MacOS Big Sur 11.01 on a Mac M1 and the LG 5k2k screen.

My recommendation would be to buy the USB C to Displayport cable. Please watch out. You get a 4K 60Hz one that wont drive Displayport 1.4. Buy the more expensive cable that can drive more than 4K (up to 8K 60Hz). Its worth the investment: https://www.amazon.com/gp/product/B01J6DT070/

Unfortunately, none of this helps with getting HiDPI resolutions that was possible before. Yet.

I hopes this helps a little while we try to figure out a solution for the M1 or Apple fixes this in future versions of MacOS Big Sur.

Hey, thank you for this incredibly helpful reply. One follow-up: Does your last line mean that you expect future MacOS software changes to solve this resolution problem? I got an ultrawide (I need for teaching) with a M1 mini but it doesn't give me ultawide. Do you expect it will (assuming the right connections) or should I just return the monitor.

 

[itrends]

Try opening the display preferences, then WHILE HOLDING the option key, click on the 'scaled' option / radio button. It will hopefully show you more resolutions including the one for your monitor.

I have to set this each time my machine wakes at the moment, so instead I have put sleep to take longer than usual for the time being until a fix is issued.

I also find that if I shut down the machine, when I turn it on again the resolutions are still correct. It is only sleep that is messing things up.

This is my before and after

 

[mwa3aan]

Hey, thank you for this incredibly helpful reply. One follow-up: Does your last line mean that you expect future MacOS software changes to solve this resolution problem? I got an ultrawide (I need for teaching) with a M1 mini but it doesn't give me ultawide. Do you expect it will (assuming the right connections) or should I just return the monitor.

What monitor model do you have and what cable are you using between the mini and the monitor? That help me to give you the correct advice.

 

[Lessig]

What monitor model do you have and what cable are you using between the mini and the monitor? That help me to give you the correct advice.

I have the LG 49WL95C-W. I was using the "USB C to DisplayPort Cable for Home Office (4K@60Hz, 2K@165Hz), uni Sturdy Aluminum DisplayPort to USB C Cable [Thunderbolt 3 Compatible] for MacBook" but I have just purchased the "StarTech.com 6ft/1.8m USB C to DisplayPort 1.4 Cable - 4K/5K/8K USB Type-C to DP 1.4 Alt Mode Video Adapter Converter - HBR3/HDR/DSC - 8K 60Hz DP Moni" which should arrive today. Thank you! (There was something written at MonitorArms.co combined with something at AppleInsider that suggested that if you ran two cables to the monitor, it might figure it out. I've not tried that yet.

 

[eba]

I'm using an Asus MX34VQ ultrawide (3440x1440 at 100Hz) via HDMI. Works perfectly. Used the Terminal tweak to increase font smoothing, and everything looks great.

 

[mwa3aan]

I have the LG 49WL95C-W. I was using the "USB C to DisplayPort Cable for Home Office (4K@60Hz, 2K@165Hz), uni Sturdy Aluminum DisplayPort to USB C Cable [Thunderbolt 3 Compatible] for MacBook" but I have just purchased the "StarTech.com 6ft/1.8m USB C to DisplayPort 1.4 Cable - 4K/5K/8K USB Type-C to DP 1.4 Alt Mode Video Adapter Converter - HBR3/HDR/DSC - 8K 60Hz DP Moni" which should arrive today. Thank you! (There was something written at MonitorArms.co combined with something at AppleInsider that suggested that if you ran two cables to the monitor, it might figure it out. I've not tried that yet.

Lessig, I have the LG 5K2K, which is not being sold by LG anymore) and use the USB C to Displayport 1.4 cable I linked to. That was the only cable that allowed me to run the full 5120x2160 resolution or 3008x1269 HiDPI (Which is actually still 5120x2160 but HiDPI scaled to look bigger with a crystal clear image) at DP 1.4. I did manage to get the same resolution at DP 1.2 with a Thunderbolt to Thunderbolt cable that came with the screen.

Thats more data than your monitor requires at 5120x1440.

Your resolution of 5120x1440 is 7372800 pixels at 60Hz refresh rate. 4K (3840x2160) is 8294400 pixels at 60H. Theoretically either a high speed HDMI cable or 4K USB to Displayport cable should be able to drive your monitor from the M1 Mac Mini.

I have never tried the dual cable scenario and cannot comment on that.

As for waiting for an update from Apple, I would not bet on that. I installed the latest version of the 11.1 Beta last night but there seems to be no obvious changes to how screen resolutions are driven.

I would say the best advice for now is to either:
- Hope one of the new cables work when they get delivered today (In my case the cable allowed DP 1.4 which should have been possible with Thunderbolt but wasn't working. Please let us know)
- Use the option+click on the resolution to see if you get higher options available and then use the terminal font smoothing trick to try and make the anti aliasing manageable. This will help with fonts only and not really improve non font artifacts on the screen.
- return the screen for a more standard 4K (or 5K) resolution that will give you HiDPI and a great image.

I am sorry I cannot be more helpful than this. I will continue to try and find a way to make the old custom resolution configs work, but right now cannot promise anything.

 

[Lessig]

I have the LG 49WL95C-W. I was using the "USB C to DisplayPort Cable for Home Office (4K@60Hz, 2K@165Hz), uni Sturdy Aluminum DisplayPort to USB C Cable [Thunderbolt 3 Compatible] for MacBook" but I have just purchased the "StarTech.com 6ft/1.8m USB C to DisplayPort 1.4 Cable - 4K/5K/8K USB Type-C to DP 1.4 Alt Mode Video Adapter Converter - HBR3/HDR/DSC - 8K 60Hz DP Moni" which should arrive today. Thank you! (There was something written at MonitorArms.co combined with something at AppleInsider that suggested that if you ran two cables to the monitor, it might figure it out. I've not tried that yet.

Now using the 8k display cable, and I tried the option+scaled option. It gave me the 5120 preference, but marked as "(low resolution)". Progress?

 

[mwa3aan]

Now using the 8k display cable, and I tried the option+scaled option. It gave me the 5120 preference, but marked as "(low resolution)". Progress?

Hmm. My personal feeling is no, but its up to you as per below. Thats an expensive screen and running it at "low resolution" isnt getting value for your money.

Even though it says "low resolution" it should be rendering pixel for pixel, which means your windows on the screen will be really small. so its rendering 5120 pixels across and 1440 down.

Even though that gives you a lot of screen space its not exactly the idea behind higher resolution screens.

So called "Retina" displays (which is just an apple marketing term) is that the pixels are so high resolution that they can render screen artifacts bigger but still crisp because your eyes cannot see the pixels (or pixel combinations).

A new Macbook Air M1 internal display at its highest resolution options says "Looks like 1680 x 1050" when it is in fact running at 2560 x 1600 with a pixel zoom presenting the crisp resolution that looks like 1680x1050. In Windows this is called "Zoom Display"

Try the following: Download RDM (https://github.com/avibrazil/RDM) at the very bottom of the page and run it. Its a simple utility that doesnt install anything risky. When its running its in the menubar. When you click on it it brings up the current resolution and when you click on that it shows a resolution list. See if you have any resolutions with a lightning bolt next to it. Thats an HiDPI resolution. If you select that you will get a great screen quality.

If you dont see any lightning bolt resolutions then select one that is most comfortable for you.

The binary is not signed, so when you run it MacOS will warn that its unsafe and it wont open it. Go so system preferences and open "security & Privacy" and under the general section click "open anyway". it will show a warning. click ok.

It will show you all possible resolutions of your screen/mac combination. If there are no resolutions that make you feel "wow, brilliant" I would return the screen and spend my money on something that will give you the value you want for the $ you are spending.

At the end of the day there will be a point of personal satisfaction. Some people are ok with the slightly fuzzy resolutions. Especially if they disable font anti-aliasing. Thats your choice.

Again, I hope the above helps to get you to a position where you can make the right decisions for your circumstances.

 

[Lessig]

Hmm. My personal feeling is no, but its up to you as per below. Thats an expensive screen and running it at "low resolution" isnt getting value for your money.

Even though it says "low resolution" it should be rendering pixel for pixel, which means your windows on the screen will be really small. so its rendering 5120 pixels across and 1440 down.

Even though that gives you a lot of screen space its not exactly the idea behind higher resolution screens.

So called "Retina" displays (which is just an apple marketing term) is that the pixels are so high resolution that they can render screen artifacts bigger but still crisp because your eyes cannot see the pixels (or pixel combinations).

A new Macbook Air M1 internal display at its highest resolution options says "Looks like 1680 x 1050" when it is in fact running at 2560 x 1600 with a pixel zoom presenting the crisp resolution that looks like 1680x1050. In Windows this is called "Zoom Display"

Try the following: Download RDM (https://github.com/avibrazil/RDM) at the very bottom of the page and run it. Its a simple utility that doesnt install anything risky. When its running its in the menubar. When you click on it it brings up the current resolution and when you click on that it shows a resolution list. See if you have any resolutions with a lightning bolt next to it. Thats an HiDPI resolution. If you select that you will get a great screen quality.

If you dont see any lightning bolt resolutions then select one that is most comfortable for you.

The binary is not signed, so when you run it MacOS will warn that its unsafe and it wont open it. Go so system preferences and open "security & Privacy" and under the general section click "open anyway". it will show a warning. click ok.

It will show you all possible resolutions of your screen/mac combination. If there are no resolutions that make you feel "wow, brilliant" I would return the screen and spend my money on something that will give you the value you want for the $ you are spending.

At the end of the day there will be a point of personal satisfaction. Some people are ok with the slightly fuzzy resolutions. Especially if they disable font anti-aliasing. Thats your choice.

Again, I hope the above helps to get you to a position where you can make the right decisions for your circumstances.

Thanks for this really really helpful followup. I'm stuck needing an ultrawide screen — I teach and need to have as much of the class on my screen as possible.

For completeness, here's the result: Using a Mac mini (M1 2020) running Big Sur 11.0.1 and using an 8K Displayport to USB-C cable, I was able to get my LG 49WL95C-W 49" to offer 5120x1440, but only if I select the extended scaling options by holding the Option key while pressing "Scaled" in the Display preferences panel. (Thanks to #79 for that tip). That then gave me the choice of 5120x1440 "(low resolution)."

Is the resolution issue something that later revs of the OS will improve?

 

[mwa3aan]

Thanks for this really really helpful followup. I'm stuck needing an ultrawide screen — I teach and need to have as much of the class on my screen as possible.

For completeness, here's the result: Using a Mac mini (M1 2020) running Big Sur 11.0.1 and using an 8K Displayport to USB-C cable, I was able to get my LG 49WL95C-W 49" to offer 5120x1440, but only if I select the extended scaling options by holding the Option key while pressing "Scaled" in the Display preferences panel. (Thanks to #79 for that tip). That then gave me the choice of 5120x1440 "(low resolution)."

Is the resolution issue something that later revs of the OS will improve?

They might and one would expect it would be a priority BUT Apple moves at their own pace and against their own priorities. They did make changes and in the process accommodated new screens in MacOS 10.14 and 10.15.

I would rather bet on someone with deeper technical knowledge than me figuring out how to bring overrides back to the M1. Overrides work on Intel based MacOS 11 machines.

I am continuing to fiddle with M1 override generation and will let you know when I find something. Please do the same.

Enjoy the Holidays and thank you for the incredible work you guys as teachers do daily. I have 2 kids in school and cannot stop talking about the respect I have for the amazing work teachers are doing during these times.

 

[Nuttz565]

Here are a couple of points:
- The scripts that used to work on Intel macs that created custom display resolutions don't work on Macs with M1. The reason is the device architecture changed. These scripts used grep to search the ioregistry for display string identifiers such as 'IODisplayEDID'. That changed with the M1 and is now under new keys such as armio and disp0. Thats why using these scripts on an M1 based mac results in override config files with no verndor ids. I dont have a solution for this yet.
- Secondly, in post 53 your refer to switching to displayport 1.2 on your screen. That will fix the situation with the LG 5k2k screen if you use thunderbolt. It works for now, but is in reality a bug. The M1 macbooks and mini supports displayport 1.4 and the LG 5k2k also supports 1.4 natively. Unfortunately it maxes out at an HiDPI of 3008x1269, which renders in HiDPI and is crystal clear, but the monitor is capable of much more. It can actually render HiDPI of 3360x1417 which is also crisp and clear and the perfect resolution for this monitor. Intel based Macs will show this as an option but the M1 doesn't and you cannot force it with a custom script because OSX doesn't honor the overrides on an M1 mac (as per the bullet above)
- In post 58 you mention using a USB C 3.1 cable. USB C 3.1 alone has no ability to drive displays without the cable supporting Thunderbolt or terminating in a displayport. The screen end of the cable needs to connect using either Thunderbolt (on a display that supports Thunderbolt) or a normal Displayport. Thunderbolt over USB C ports or DisplayPort over USB C ports can drive displays. In the case of the LG 5K2K you can use displayport 1.4 (which can carry more data for theoretical higher HiDPI) if you use a USB C to Displayport 1.4 cable. I will link to one below. That cable will allow the Mac mini to connect to the LG 5k2k using displayport 1.4. I verified that this works. Thunderbolt over USB C should allow you to use DP 1.4 but wont currently work with MacOS Big Sur 11.01 on a Mac M1 and the LG 5k2k screen.

My recommendation would be to buy the USB C to Displayport cable. Please watch out. You get a 4K 60Hz one that wont drive Displayport 1.4. Buy the more expensive cable that can drive more than 4K (up to 8K 60Hz). Its worth the investment: https://www.amazon.com/gp/product/B01J6DT070/

Unfortunately, none of this helps with getting HiDPI resolutions that was possible before. Yet.

I hopes this helps a little while we try to figure out a solution for the M1 or Apple fixes this in future versions of MacOS Big Sur.

Good info but I'm running into a issue with my M1 Mac Mini and using the USB C to Display Port. I currently have a Dell 32" Monitor with a 2560 x 1440 resolution. I was using the HDMI output to HDMI on the monitor with no issues. Was able to get the 144mhz setting to work and set it at the full resolution and had no issues. I since though wanted to try out the USB C to Display port for my monitor and I'm running into issues with the monitor coming on once the Mac goes to sleep. I have tried 3 different cables that go all the way up to 8k so I know its not a cable issue. If I reboot the Mac the display will work correctly using the Display Port to USB C cable but once the MM goes to sleep the monitor will not come back on until the MM is rebooted. From reading over various forums there seems to be continuous issues with the Mac Mini and Display port not working correctly. Have you seen any fix to this?

 

[JoshVic]

Lessig, I have the LG 5K2K, which is not being sold by LG anymore) and use the USB C to Displayport 1.4 cable I linked to. That was the only cable that allowed me to run the full 5120x2160 resolution or 3008x1269 HiDPI (Which is actually still 5120x2160 but HiDPI scaled to look bigger with a crystal clear image) at DP 1.4. I did manage to get the same resolution at DP 1.2 with a Thunderbolt to Thunderbolt cable that came with the screen.

Thats more data than your monitor requires at 5120x1440.

Your resolution of 5120x1440 is 7372800 pixels at 60Hz refresh rate. 4K (3840x2160) is 8294400 pixels at 60H. Theoretically either a high speed HDMI cable or 4K USB to Displayport cable should be able to drive your monitor from the M1 Mac Mini.

I have never tried the dual cable scenario and cannot comment on that.

As for waiting for an update from Apple, I would not bet on that. I installed the latest version of the 11.1 Beta last night but there seems to be no obvious changes to how screen resolutions are driven.

I would say the best advice for now is to either:
- Hope one of the new cables work when they get delivered today (In my case the cable allowed DP 1.4 which should have been possible with Thunderbolt but wasn't working. Please let us know)
- Use the option+click on the resolution to see if you get higher options available and then use the terminal font smoothing trick to try and make the anti aliasing manageable. This will help with fonts only and not really improve non font artifacts on the screen.
- return the screen for a more standard 4K (or 5K) resolution that will give you HiDPI and a great image.

I am sorry I cannot be more helpful than this. I will continue to try and find a way to make the old custom resolution configs work, but right now cannot promise anything.

Hi, I also have the LG 5K2K monitor and I just bought this cable:
https://www.amazon.com/Cable-Matter...ers+Cavo+USB+C+a+DisplayPort&qid=16077219&sr= 8-5

It is a USBc TO DisplayPort cable 1.4 that supports 8K 60Hz resolution like the one you linked but from a different brand.
Unfortunately with my mac mini M1 I am not able to have HiDPI resolutions.
I am able to have only the low resolution ones (5120x2160, 3440x1440, etc.) not in HiDPI. Instead if I use the a thunderbolt cable, so also the thunderbolt port in the monitor, I have all the HiDPI option until 3008x1269 HiDPI (the maximum).

Really weird, it's not a mac mini M1 problem because i have the same problem with an intel macbook pro.
At first I thought it was a problem with this cable with mac, maybe he doesn't like usbc to displayport cables so much. But then I did a test with a 4k LG monitor (16: 9 format not ultrawide), and here it works correctly, I can get the resolutions in HiDPI. That's just a problem with this cable and the ultrawide 5K2K monitor we have.

With the Startech cable, do you have the HiDPI options?

 

[Dozer461]

I think I’m going to contact them also. I’ve been having some issues with it waking up to a completely different resolution to my LG 4K tv like displaying on 1/4 of the screen, sleeping and waking a couple times has corrected that but today I started getting a green screen and it will not display video. My tv registers it and tells me it’s hdr and whatnot but then no output. It’s like it’s sending a signal but the signal is nothing. I’ve also had it freeze a couple of times which is bizarre. So frustrating. I want to return it but I already bought a bunch of accessories from various places. I guess replacement it is. It feels as if it needs like a huge software update.

 

[AndyS2K]

I'm so angry....Mac mini M1 and LG34Wk95U. There is some incompatibility. The 5120 2160 works great also with hdpi. But when the Mac goes in sleep sometimes the screen change resolution....and I have to remove the connector.....I have tried thunderbolt from lg, thunderbolt certified 40gb and also thunderbolt to display port. Also the lg software doesn't see the monitor. I have tried switchers and also the other res program but for me the problem is not the resolution but when the Mac or monitor goes to sleep. If I power on first the monitor and after press the mouse to exit the sleep of the Mac mini al works better but sometimes the problem of the wrong resolution come....and I have to restart Mac mini or remove the cable and reconnect..

 

[itrends]

I'm so angry....Mac mini M1 and LG34Wk95U. There is some incompatibility. The 5120 2160 works great also with hdpi. But when the Mac goes in sleep sometimes the screen change resolution....and I have to remove the connector.....I have tried thunderbolt from lg, thunderbolt certified 40gb and also thunderbolt to display port. Also the lg software doesn't see the monitor. I have tried switchers and also the other res program but for me the problem is not the resolution but when the Mac or monitor goes to sleep. If I power on first the monitor and after press the mouse to exit the sleep of the Mac mini al works better but sometimes the problem of the wrong resolution come....and I have to restart Mac mini or remove the cable and reconnect..

Same here with different monitors. Just have to wait for a software update.
11.1 should come out today / this week and may contain fixes.

 

[AndyS2K]

Already installed the 11.1 and nothing change....

One solution that works 80% of time si first power the monitor and than make the Mac mini exit from sleep.....but not so good to use.

 

[itrends]

Sorry to hear. Looks like we will all be waiting a little longer for a fix.

What I do know is that if I manage to load the displays preference and change the rest one down and then one up it will reset the screen. So I am considering creating an automated task that will do that when I unlock the Mac.

Overall, I have increased my sleep/screensaver time to a few hours for now so that during my work day I don't encounter any issues. I then shut down over night so it will be good again when I boot in the a.m.

I see this as a temporary plaster of course and will expect a fix, but possibly not until the new year.

If the biggest problem I face is a weird resolution but, then my life is good considering what's going on in the world. A chance to practice the art of patience and thankfulness.

I appreciate that isn't really a whole lot of help to you though and I hope a fix comes soon to remove your problems.

 

[JoshVic]

I'm so angry....Mac mini M1 and LG34Wk95U. There is some incompatibility. The 5120 2160 works great also with hdpi. But when the Mac goes in sleep sometimes the screen change resolution....and I have to remove the connector.....I have tried thunderbolt from lg, thunderbolt certified 40gb and also thunderbolt to display port. Also the lg software doesn't see the monitor. I have tried switchers and also the other res program but for me the problem is not the resolution but when the Mac or monitor goes to sleep. If I power on first the monitor and after press the mouse to exit the sleep of the Mac mini al works better but sometimes the problem of the wrong resolution come....and I have to restart Mac mini or remove the cable and reconnect..

The same for me. But instead to remove the cable and reconnect, I just change the input source in the LG monitor for example to displayport, then I change again to thunderbolt. At least I do not remove the cable everytime. That said, I confirm you that this Mac M1 have some issue with the ultrawide monitors.

 

[AndyS2K]

The same for me. But instead to remove the cable and reconnect, I just change the input source in the LG monitor for example to displayport, then I change again to thunderbolt. At least I do not remove the cable everytime. That said, I confirm you that this Mac M1 have some issue with the ultrawide monitors.

Ok, also power of the monitor and power on works.
It seems that if I power on the Mac mini before the monitor, the Mac mini take a wrong resolution. I don't understand why but also this happen with the last beta 11.1 so I don't know if the problem is known in lg and apple....

 

[AndyS2K]

Sorry to hear. Looks like we will all be waiting a little longer for a fix.

What I do know is that if I manage to load the displays preference and change the rest one down and then one up it will reset the screen. So I am considering creating an automated task that will do that when I unlock the Mac.

Overall, I have increased my sleep/screensaver time to a few hours for now so that during my work day I don't encounter any issues. I then shut down over night so it will be good again when I boot in the a.m.

I see this as a temporary plaster of course and will expect a fix, but possibly not until the new year.

If the biggest problem I face is a weird resolution but, then my life is good considering what's going on in the world. A chance to practice the art of patience and thankfulness.

I appreciate that isn't really a whole lot of help to you though and I hope a fix comes soon to remove your problems.

For me this doesn't work because also if the monitor goes to sleep the weird resolution come when I press mouse button to make the Mac mini alive. I have to remember to power on the monitor before everything

 

[AndyS2K]

I think that I have understood the problem this morning.....If I press the power button of the monitor before Mac mini exit the sleep all works great. If I make the Mac mini exit from sleep with the monitor in sleep the weird resolution come.....

 

[Fishrrman]

I've said this numerous times before and I'll repeat:
There's no need to use "sleep" on a new Mini.
Just put the display to sleep (as distinguished from "computer" sleep), or reach around, turn the display off and walk away.

The difference in power consumption between a "sleeping" and an "awake, but idling" 2020 Mini is negligible, next-to-nothing.

If you're worried about someone accessing the computer when you're away from it, set up a password to unlock the display.

 

[itrends]

That’s great if you don’t also depend on sleep to put a bunch of other devices to sleep as well.

a solution for some.
Also worth noting that display sleep causes the issues, not just Mac mini sleep. And running a screensaver isn’t energy efficient either. Etc.

So I appreciate where you are coming from. And it is indeed a temporary workaround and possibly a long term solve for some. But overall this is old school basic computer function that is very clearly impacting a lot of people. It needs fixing.