Mac Mini (M1) 2020, LG UHD monitor flickers on dark colours.

Having the same issue with a Dell S2817Q — It works fine on my ancient 2010 Mac Pro, but exhibits the flickering behavior you describe when connected to the Mac Mini. I've tried HDMI to HDMI, Thunderbolt to DisplayPort, Thunderbolt to Mini DisplayPort, Thunderbolt to HDMI, and HDMI to DisplayPort (!!!!) cables with it to no effect. Swapping in a lower-resolution monitor like my old Dell U2713HM works fine, but the 4K monitor flickers intermittently.

Mine seems to flicker regardless of the background color; what's on the screen certainly seems to affect it (dragging a window a few pixels to the side can stop the flickering for a moment, but it starts up again after a few seconds). Love the Mini in every other way, but this is making it reallll hard to switch my actual work to it.

Same issue, Macbook Air and LG 32UN500-W.

Doesn't seem like flickering on my other FHD Acer SA240Y. But i don't use that heavily (since Macbook M1 supports only one external display...) so maybe i didn't notice yet.

Contacted both Apple and LG, not much help from either.

So, just a quick update... After installing the MacOS 11.2 update that was released today, the flickering display problem still occurs! It's very consistent when there is a scene that fades from light to black. Very disappointing...

Hi there. This problem also occurs on my AOC c24g1 monitor. When displaying dark colours the monitor flickers with grey diagonal lines. This also happens in Logic Pro X with its dark grey UI..

Using Mac mini m1

Thanks I have ordered a LG 27UL550 today, it arrives Monday , I assume the -W on the end means white back I couldn't find a LG 27UL550-W only a LG 27UL550 ? lets see if it solves the problem. What worries me is others who also have the LG27ULxxx brand also report some issues so it sounds like specific models work and other do not.

From messing around with the BENQ while working its almost as if its some kind of sync conflict between the image processing the monitor is doing itself and the signal its getting from the Mac mini.

If you think about it , apples own internal LG panels within the iMac and MacBook do not have any 3rd party image processing going on by the monitor chipset. On a given image that makes the monitor flicker if I move that sharpness control the image goes perfect. It then flickers on other images, doing the same brings back the image as perfect again. Sharpness is manipulating the image via the monitors own processing. Shame there is no direct bypass mode where the Mac mini directly controls the panel with no additional processing e.f 'eyecare' , brightness, contrast, HDR etc etc

So, is Apple going to FIX this?

It's obvious this is affecting a very large amount of users with many different *NEW* monitors. It seems ridiculous to me that the Mac Mini M1 can only work properly with a small select few monitors. I've been experiencing this issue with my Samsung U32R59x displays (HDMI and DP) and I know there's many other people out there using these same monitors with the M1-based machines and experiencing the same symptoms.

Anyone else getting really frustrated with this issue?

I have the same issue with my new Mac Mini M1 bought last week. I also connected a 32“ 4k Samsung screen. The only situation where I see the issue massively is when displaying music.amazon.de (Yes I have to use that instead of Apple Music, because the Apple Music Skill for my Amazon Echos is useless) website. No issue if I display dark pictures or content. It‘s only happening when displaying this darf website except one other situation. If selected some darker background images, I can also see fine vertical lines on the logon screen. But no flickering there. This is really frustrating, not because I‘m having the issue often, more because I don‘t here anything from Apple (already discussed that with the support) and I don‘t know at the end if it‘s a solvable SW issue or a HW topic.

Today I‘m getting a Thunderbolt to DP cable and my hope is, that the behavior is different instead to the HDMI connection today. But I‘ll see...

So... just updated to 11.2.2 and the problem still exists, maybe even worse now. My second monitor (Samsung R32R59x connected via DP through a CalDigit TS3+) just kept flashing and trying to "sync" this morning when I turned the computer on after fresh installation of the update. It took a few moments of it "flashing" off and on before it started working again. First time this has happened to me... normally it was just the "flickering" issue as described by the original poster. it's quite amazing that these M1-based machines are having so much trouble with 4K Monitor support!!

Get the LG27UL550 , been working perfectly now for over a month with no shimmering / flickering.

Disgusting how apple deletes posts they don't want on here. It really makes you think about buying another apple product.

Same problem, M1 Mac mini with a LG Ultrafine 4k 32UL950-W.

It’s sort of a disaster how poorly this monitor is supported. I have this issue as well as audio issues with the monitor’s built in speakers when using certain voice call apps (FaceTime, WhatsApp, Google Meet) not sure who to blame for all of this.

Yeah, I'm in the IT field and had serious doubt about their suggestion of buying an adapter. I tried using USB-C to HDMI cable, HDMI-HDMI cable, and using a USBC-HDMI adapter. Also found a guy's suggestion on Reddit to force the M1 Mini into RGB (the default color profile is YPbPr on my Dell), but that didn't help either.

I'm the same way, came over from the Windows side saw that Dell on Slickdeals for like $330 shipped and bought it thinking it'd be the perfect high res monitor for my M1 mini, boy was I wrong.

I should also mention that Dell sent me an e-mail asking me to review my purchase, so I gave an honest review (1 star) and in the review, I detailed the issues and said if you're using a Mac Mini M1 that you should not buy this monitor and they "moderated" my review (basically rejected it). I wasn't very happy about that either.

There is a formula that will allow us to know which screens work with M1 it just needs to be found. I thought it was any IPS panel but it’s not , I think it’s something to do with the chipset used in the monitor that drives the panel as quite a lot of the LG screens work in the newer range but a few don’t. That would suggest the screens driver chipset is probably the same on many LG monitors

mine are both IPS panels and Benq's are quite good on their price range. my displays are working perfectly with my windows laptop and MBPs but not with my new mac mini M1. so the problem is with the mac mini M1.

but there are people who are using the same displays with no problem at all. I'll see with the new logic board if this will still be persistent. if it does then it's compatibility indeed and they need to do some fundamental changes on their hardware/OS.

Well, I think every owner of *two* different M1 Macs who has experienced this issue could reproduce it on both computers - I haven't read a single posting saying only one of the M1 Macs was affected.

I also haven't read of a "successful" replacement, so I think it's not some defective units, but rather a design issue with the M1 SoC.

I hope the board replacement fixes the problem for you, but I have doubts. If it does, it could mean your problem was either some different issue altogether or Apple has secretly released a new hardware revision.