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

Thanks! Yea I’m not sure I might have to change monitor too. I’ve tested my MBP 13 (2016) and an Apple TV 4K, and both flicker a small bit, (in the same way, when a certain dark colour palette is displayed, though not as extreme as the Mac mini)

though I’ve only tested them for about 5 mins, and maybe they get worse over time?

anyway, it feels like it could be the monitor. I haven’t tested a non apple product yet.

I have an ASUS MG28U 4K monitor. Thunderbolt to HDMI cable. Tried a different cable, as well as Thunderbolt to Displayport. Same issues. Interestingly enough I'm not getting that issue on my main display (Samsung U28E850) which is connected via the HDMI port on both ends. Perhaps it's a USB-C issue? Regardless, looks like we'll have to wait for Apple to drop a fix.

Same problem with a MBP M1 hooked to an Acer Predator XB281HK 4k60Hz. Plenty people reporting the issue here as well: https://forums.macrumors.com/threads/m1-air-ghosting-flickering-with-external-display.2271670/

This requires an urgent fix IMO. I'm considering returning the unit, my display has been working great with both PCs and MBP for years.

Also, it appears to occur an all M1 machines, be it MBP, Air or Mini.

For my LG 32UN500-W monitor the best solution that I was able to find was to go to displays, and then colors and then use the sRGB IEC61966-2.1 color profile with my monitor on cinema for picture mode. it dose not fix the problem 100% but is the best that I can find, the color accuracy is also not to bad in this settings. I hope they can fix this problem soon. in the mean time I hope this help some of you.

I have the same problem, my Mac mini arrived yesterday, plugged into my LG 32UN500 and I made a short time-lapse video on Final Cut Pro, part of the time-lapse has narrow vertical lines and induces a flicker when I play it in full screen. Glad at least that it isn't just me!

Is everyone going to return their monitors for a different one or wait to see if there is a patch in the works?

thanks

since my monitor was just bought I decided not to wait for the software fix (which should come but who knows when) and returned the monitor. Instead I bought a Benq and this one works well with no issues.

It’s a personal judgement, but ... Apart from the fact that one of them flickers and the second one does not, there is no perceivable difference in day to day use :) Specs say that LG has more nits (350) but at 60% Benq (300) is certainly bright enough. The speakers of both those monitors are abysmal. Google the reviews of Benq - they all say it’s a good monitor considering the price. I liked that LG has a white back, but I’m not really that much interested in watching the back or the monitor. A plus for Benq is USB-C with cable included. I’m connecting via hdmi but it’s nice to have a choice.

Just an observation I've had, that maybe somebody else can test,

Ive set the black levels to high. and my monitor hasn't flickered all day, just wondering if anyone else has tried anything like this. (the picture definitely looks better with black level set to low, but I'm wondering if this is the issue)

I’ve not tried this, I was on a virtual chat with an apple rep who asked me to do a number of things, non that worked. The last thing she asked me to do was install the latest firmware for the monitor.... I’m not sure how you do this, any ideas?

I have 2x UHD LG 27" UL600 model. First I though it was the monitor then the problem went away but then it came back. I swapped the monitors around and the problem still occurs randomly. It only happens to the HDMI connection, Thunderbolt is fine and too bad the M1 won't allow you to run dual display off of the thunderbolt ports.

I tried changing resolution as well and it does not fix the issue.

I hope there's a fix soon. This makes one of my monitors completely useless at times.

for a temp fix. It seems like if I change the background image to black, it helps a bit there is less “flickering” on areas that I don’t have an open window on. I did this a few times when flicker returns and it goes away after a few tries.

last 2 days it was fine as I use the monitors for over 8 hours a day.

I also noticed that sometimes the second display does not wake up unless I disconnect and reconnect the thunderbolt cable. M1 just seems buggy all around with the graphics.

Hi

Yes I have the same problem here! I just bought this LG 32" UN500 unaware of the problem.. but when there's dark shading on the Big Sur interface it will flicker between the dark and lighter shading.

In System Properties when I use the search bar, Big Sur will dim the interface (the icons will go dimmed) that's when this sudden light flicker occur to the overall display.

In the screen saver, if you select the Drift as screen saver, you will notice the flicker happen when its dimming from light to darker shades.

When hitting the Dashboard on the keyboard to pull up all my Application, the screen have this slight vertical dark bands happening all across the screen. This does not happen on any other monitor I own and even when the LG is connected to my old MacBook Pro

Im sure hope Apple is aware of this bug.. it seems like can be corrected with software update. As video professional its a bit annoying when I'm working and I know Iv should have researched better. But I love the LG and plan to stick to this monitor. Hopefully Apple will fix this problem soon!

Cheers!

Technica Studios

And I have a new M1 Mac mini directly connected to an LG 32UN880-B 4K Ultrafine Ergo display with a new Belkin 4K HDMI 2.1 cable (future proofing) and the display is sharp, without any display aberrations. I might add that this display is professionally color calibrated at the factory by LG.

I've arranged now to return the M1 Mac mini, alongside the display issues, I have repeatedly encountered issues with the Mini failing to connect to the bluetooth (Magic) keyboard as well as occasionally dropping the connection to the (magic) trackpad. Too many issues now for me to just hope that Apple sorts this out. I have seen now in previous reports that the older Mac mini also had bluetooth issues so perhaps its a problem with the build.

Such a shame as I was really hoping this would be a great little computer..... Steve Jobs would be spinning in his grave with the lack of quality control

bw

Andrew

My new extended Apple Magic Keyboard never disconnects or misbehaves with my new M1 mini. The five-year old Magic Mouse 2 frequently disconnects at random intervals, and there is nothing nearby to initiate this issue. It has received heavy usage, and it may be that the device itself is beginning to fail.