I had the same issue with macMini 2018 connected to LG 4K TV. The fix that worked for me is to change a setting in the TV. Toggle ON the setting for HDMI Ultra HD Deep Color, it’s found in advanced Picture settings of the tv.
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Issues updating to OS Catalina on 2018 Mini
- Thread starter weaztek
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I had the same issue with macMini 2018 connected to LG 4K TV. The fix that worked for me is to change a setting in the TV. Toggle ON the setting for HDMI Ultra HD Deep Color, it’s found in advanced Picture settings of the tv.
That's good to know. On my LG monitor the HDMI Ultra HD Deep Color was already on.
I have set my Energy Saver to never sleep the monitor. Instead I turn off the monitor when I'm walking away from it.
If this display bug is related to sleep on the Mac, I think this will help until they come up with a fix. Since I changed that setting I haven't had any problems but it's only been a day or two since I changed it.
I have set my Energy Saver to never sleep the monitor. Instead I turn off the monitor when I'm walking away from it.
If this display bug is related to sleep on the Mac, I think this will help until they come up with a fix. Since I changed that setting I haven't had any problems but it's only been a day or two since I changed it.
I'm having the same issue. I posted my details here:
discussions.apple.com
I really hope a fix for this is released soon. :-(
After Catalina upgrade, MAC mini not conn… - Apple Community
I really hope a fix for this is released soon. :-(
The only solution that appears to work in all instances is to use a USB-C to HDMI or DP cable. HDMI to HDMI is the cause in all cases it appears.
The cable that seems to work in everyone I have seen fixing their issue is this one, but any good quality cable should work.
uni USB C to HDMI Cable【4K@60Hz High Refresh Rate】Type-C to HDMI Cable [Thunderbolt 3 Compatible] for MacBook Pro, MacBook Air, iPad Pro 2018, Surface Book2, Galaxy S20, and More - Grey - 6ft/1.8m
uni USB C to HDMI Cable【4K@60Hz High Refresh Rate】Type-C to HDMI Cable [Thunderbolt 3 Compatible] for MacBook Pro, MacBook Air, iPad Pro 2018, Surface Book2, Galaxy S20, and More - Grey - 6ft/1.8m
www.amazon.co.uk
I am in the same boat as you for now.
However, I remember the shift from OS9 to OSX beta and couldn't believe how garbage the system was then! Slowly but surely, revision after revision, it started to make sense. I'd say this leap from Mojave to Catalina is almost as shocking as that transition.
However, I remember the shift from OS9 to OSX beta and couldn't believe how garbage the system was then! Slowly but surely, revision after revision, it started to make sense. I'd say this leap from Mojave to Catalina is almost as shocking as that transition.
I think my issue is now resolved. They ended up replacing y logic board, but the issue was likely software as we all suspected. Apparently 10.15.1 was supposed to correct the problems...
Apparently NOT ALL upgrades to 10.15.1 are created equally. For those running 10.15.1 and still having issues, but you have a functioning display (however you may have accomplished that)... go to the "apple menu" and select "about this MAC". Select "system report". In the listing tat comes up under "hardware" go do to "Graphics/Displays", select that. The last item in the listing that comes up under "Displays" (which should be your connected display) you will see "Adapter Firmware Version:" it SHOULD BE "2.15"
Apparently some 10.15.1 installs were NOT installing this for whatever reason. If it is anything other than 2.15, that is BELIEVED to be the issue... (or at least one of the issues). Hope this helps someone go in the right direction. MOST of the Apple people I dealt with were not at all helpful. Thank goodness for the guy I got last night. I hope my 2 MONTH Nightmare is finally over.
Apparently NOT ALL upgrades to 10.15.1 are created equally. For those running 10.15.1 and still having issues, but you have a functioning display (however you may have accomplished that)... go to the "apple menu" and select "about this MAC". Select "system report". In the listing tat comes up under "hardware" go do to "Graphics/Displays", select that. The last item in the listing that comes up under "Displays" (which should be your connected display) you will see "Adapter Firmware Version:" it SHOULD BE "2.15"
Apparently some 10.15.1 installs were NOT installing this for whatever reason. If it is anything other than 2.15, that is BELIEVED to be the issue... (or at least one of the issues). Hope this helps someone go in the right direction. MOST of the Apple people I dealt with were not at all helpful. Thank goodness for the guy I got last night. I hope my 2 MONTH Nightmare is finally over.
That's VERY interesting... I just updated the just installed "new logic board" to Catalina on 11/22 Friday night. The "new" board they installed had Mojave on it. I wonder if the hardware configuration has something to do with the version used. I went strait from Mojave 10.14 to Catalina 10.15.1
After the update, Apple's "senior tech support" rep immediately asked to check. He stated that some people were on 2.14 after the update and in his experience (finally someone who admitted to having dealt with the issue before) those were the ones having issues.
In case it might help someone with more technical knowledge, here is my hardware configuration:
Hardware Overview:
Model Name: Mac mini
Model Identifier: Macmini8,1
Processor Name: 6-Core Intel Core i7
Processor Speed: 3.2 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Hyper-Threading Technology: Enabled
Memory: 32 GB
Boot ROM Version: 1037.40.124.0.0 (iBridge: 17.16.11081.0.0,0)
Intel UHD Graphics 630:
Chipset Model: Intel UHD Graphics 630
Type: GPU
Bus: Built-In
VRAM (Dynamic, Max): 1536 MB
Vendor: Intel
Device ID:
Revision ID: 0x0000
Metal: Supported, feature set macOS GPUFamily2 v1
Displays:
LG HDR 4K:
Resolution: 6016 x 3384
UI Looks like: 3008 x 1692 @ 60 Hz
Framebuffer Depth: 30-Bit Color (ARGB2101010)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Adapter Type: DVI or HDMI
Automatically Adjust Brightness: No
Adapter Firmware Version: 2.15
Fortunately my i7 mini with an NEC EA275WMi via HDMI is still running Mojave. My MBP runs Catalina and I cannot see anything that I like about Catalina enough to upgrade the mini. Other than occasionally losing one or more of the hard drives in my OWC Thunderbay 6 the mini runs just fine. I think I'll leave it that way.