LG Ultrafine 5K M1 Mac spurious vertical shift in a 2 inch band on screen

Glad I found this thread!

I recently purchased the LG UltraFine 27MD5KL-B and 16GB Mac Mini M1 and very happy with both products. In fact, they're both absolute tops as far as I'm concerned.

The occasional vertical shift is a little irksome, though. I find bringing the Mini out of sleep mode seems to be the most common trigger for vertical misalignment in my situation.

Not a deal breaker for me but would obviously prefer to see the situation resolved with a future update.

I think the monitor is fine....the pixel shift only appears rarely. If I put the computer to sleep it goes away for a number of days.

Considering this issue I decided to just put up with it because it only takes a few seconds to correct it.

However, if returning everything and starting over with a different computer and monitor works for you that is fine.

I just decided to put up with it...

However, this issue should have never come up considers the price of the monitor.

Again, no one really knows what is causing this...people have changed cables, sent monitors back to LG etc.

If one can not live with it I would start all over again.

I did 11.5 update in early June. The update did not resolve the issue to the end – I saw vertical shift in the middle of the screen, not as wide as before, only several pixels width. It happened 2 or 3 times since the date of the update, and there is another annoying thing. Sometimes the screen goes blank for 1 - 2 seconds after awakening from sleep. Looks like they check whether the screen is correctly synchronized with the computer and, if not, put it to sleep and wake it up automatically, just as we did before the update to 11.5.

UPDATE: Apple handed us a direct swap out in store. Called LG about the problem but they refused to read any reviews or listen to feedback about the problem. Hard core liability shifting by low level staff who present as disinterested in facilitating any tangible outcome for the customer. They just waste your time with inane emails back-and-forth. "repair" offer on a brand new screen is unacceptable.

New 2nd LG screen out of box, 3 days later, banding is back. This screen is crap. And for $1900 - what a joke LG. I'm getting a full refund and backing another brand. Done with LG. Up yours.

Since the apple update I have not had any issues...I am using the apple thunderbolt cable ... who knows??? I found the admontecillo message interesting...testing on other monitors and the same behavior occurring seems to give support that it is an issue with the mac mini m1

Hey, yes .. I have this issue. There is some discussion (but no resolution) in this thread:

M1 Mini issue with LG 27" 5K Monitor

Same problem. Long winded Support Chat yesterday. It is a known problem and they are working on a fix. Meanwhile, the USB-C cable workaround is recommended.

I have the same problem. I even tried Apple's best cable...did not help. Putting the computer to sleep does help temporarly.

I invite you to write on this LG post

https://lgcommunity.us.com/discussion/16899/lg-ultrafine-5k-27md5k-firmware-update

I have updated to 11.5 and have no problems so far....the problem may have originated with the MacMini M1 or in the system software....well, at least things are going well so far!!

Same here, things are good so far with 11.5.

always OK for me for a week

clean installation in DFU mode

I too am having the exact problem. Brand new M1 Mac Mini and Brand new LG Ultrafine 5K. Vertical shift that comes out of nowhere and goes away at reboot. Will follow this thread in hopes of figuring our how to fix... permanently. I am using the supplies Thunderbolt cable. It is annoying for sure and would like to know why it is happening and how to fix. Unplugging the cable from the back of the monitor doesn't seem like a good fix.

Confirming that the problem occurs with the new Belkin Thunderbolt 3 cable as well, so it does not look like it's the fault of the original thunderbolt cable that came with the LG 5K monitor (that I ordered from Apple). I included the camera in the picture I took to see how the vertically-shifted band lines up on its right side with the center of the camera/screen. I'll update my Apple support case with the results of this test this week and see what they say...

Senior Advisor at Apple Support asked me to try with a different monitor, so I need to figure out how I'm going to arrange doing that now... Also wanted to mention that I've now had a kernel panic in "diskmanagementd" twice happen to me upon rewaking the sleeping mac/screen. Not sure if related or not.