Mac mini M1 - LG Ultrafine 5k display wake problems

Seems that more M1 machines have some trouble with the 5K model. My MacBook Pro also has some issues with the LG 5K. It refuses to use resolutions above 2880x1660... My wives 2016 MacbookPro still works fine with it. Only with switcheresx I can tweak it to run higher resolutions. LG's screen manager also does not recognize my LG Ultrafine 5K on my M1. The old MBP model has no trouble at all.... Hope there will be an update soon... Good luck!

I have the exact same issue. What I have also noticed is when I wake up from sleep, the UltraFine 5K is detected as a 4K monitor in About this Mac > Displays complete with the 3840x2160 pixel res.

Unplugging the monitor and reconnecting resolves.

Why isn’t there more information on this? MacBook Air M1 having same problem with LG ultrafine 5k. Only being shown in 4K (3840) when I can get it to work at all. Something is up with the display output with their new machines.

I'm having a similar problem with my monitors.

They connect fine on startup and operate perfectly - until and unless my machine goes to sleep. Then one or the other monitor will freeze - and/or show strange psychedelic colors - and I have to do a hard restart on the computer to get things back. Right now, the only solution seems to be not letting the computer sleep, and not letting the disks go to sleep. When I do this, everything works fine - the monitors look great (especially the Acer Predator!) with better color and detail than I've ever managed from my aging MacBook.

Similar issue - when tapping space bar or clicking mouse the 5k won’t wake up. Interestingly, when I unplug my hub in the 2nd USB-C port the monitor woke up instantly. Also - I wasn’t having issues until I started using the hub. Mind you, I’m not using the hub for the monitor but they’re both plugged in at the same time. Hopefully it’s just a firmware issue and can be patched, and not an indicator that the hardware can’t handle a 5k monitor and hub at the same time!

Did you open a ticket with apple support? They are sending me an Apple Thunderbolt 3 cable to replace the one that came with the monitor and a new Mac mini. I upgraded to to 16 gigs of ram since I was getting a new computer.

I'm having a very similar problem. On sleep or reboot, my LG 5K falls back to 4096x2304, and I have to unplug/plug the monitor power cable to get my new M1 Mac Mini to recognize it as 5120x2880. (Although occasionally, it seems to be reporting the lower resolution even while displaying the correct resolution.) Ah, the joys of first-gen hardware!

It looks like this issue will be addressed in the upcoming MacOS 11.1 release

I may try the Developer Beta version as it an RC candidate now

 LG UltraFine 5K Display may incorrectly display at 4K resolution on Macs with M1

I thought I'd found a workaround, turning off all the sleep features, but then yesterday I found my computer would not respond when the screen saver was running - had to do a hard restart to get function back. So today I've turned of screen savers too. So far no freezes, but we'll see what it looks like after an overnight. I'm considering enrolling in the Beta program too - its been suggested that update 11.1 may address the issue!

Big Sur 11.1

This release also addresses the following issues:

• 
  
• Bluetooth connection status was not displayed in Control Center
• 
  
• 
  
• Reliability of unlocking your Mac automatically with your Apple Watch
• 
  
• 
  
• Trackpad scrolling speed may be faster than expected on MacBook Pro models
• 
  
• 
  
• LG UltraFine 5K Display may incorrectly display at 4K resolution on Macs with M1
•