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

I have a new MB Pro with MI chip and a new LG Ultrafine 27 5K display I bought from Apple site. I have the exact same problem with the vertical stripe. I also tried a new Thunderbolt cable, but that made NO difference. My monitor came with a thunderbolt cable and usb c cable. I'll give that a try to see if it fixed the problem.

But still, this problem should be fixed.

Just fired up an M1 mini with an LG Ultrafine 27" 5K monitor and I see the same issue with the Y-axis shift in the center of the display. Also had to toggle the power of the display to get it to wake this morning...I loaded LG Screen manager from App Store and we'll see if the wake-up issues resolves.

CharlesHsu wrote:

Thanks! Just wonder if the thunderbolt pro cable can solve this?

Definitely not, that's what I've been using since day one with my M1 Mac mini and the LG Ultra Fine 5k and I get the same issue. I don't accept the solution of downgrading to a max of 4k, otherwise I would have bought a 4k monitor, so I'm still looking for a resolution. I can deal with disconnecting/reconnecting the monitor sporadically for now.

Wish I'd seen this thread earlier, as I'm having the same issue. I purchased mine in March for my M1 Mac mini (MFRd in Dec 2020). Noticed the issue after a couple of days. A month later I reached out to LG for resolution and they set me up to send it to them for repair. I didn't want to be without a monitor, so I reached out to the Apple Store, whom I purchased it from, and they replaced it that day (also MFRd in Dec 2020). Had the same problem. Reached back out to LG and sent it to them for repair. Got it back a month later and noticed it again after a couple days. Going to try the USB-C "solution".

My problem with the LG monitor occurred with a 2019 MacPro (not MacBook or Mac mini). I was getting the vertical shift until the screen blew completely and there was no image at all. After speaking with Apple’s tech support and doing diagnostics with my laptop attached to the monitor they were able to determine that it was indeed the display and not my MacPro that was messed up (whew). I then contacted LG who told me that it was going to take weeks for a repair leaving me with NOTHING to operate my $10,000 computer with. They have no loaner program, and gave me nothing but scripted infuriating responses after hours wasted on hold with their “customer service” that did nothing but raise my blood pressure.

Luckily I originally bought the monitor through Amazon who - if nothing else - has excellent customer service. They allowed me to return the LG crap and credited me with a full refund, three months after purchase.

I bought a 4K HP monitor for 1/2 the price of the LG that’s working perfectly. I’ll wait for a suitable 5K monitor to be released by Apple (NOT the $5,000 one) or someone else then upgrade. Stay away from LG! Their 5K monitor is a piece of S*** and their customer service is even worse.

not even replacing the MLB will fix these display issues with M1 mac mini. Had mine replaced by an AASP, and the Apple-certified tech and I tested multiple display models (VGAs display via Apple multi-AV adapter, HDMIs HD, FHD, 22 in and 32 in displays, different brand and models) and the issues are replicable and are persistent even with a just newly installed MLB! the unit is still with the AASP. 1.5 months now and counting. Even in recovery mode the problem shows.

Apple won't give me a refund; the replacement MLB is also defective.

since Saturday I am on the 11.5 RC and no problem

Thanks. I'll pass this info along to Apple on my support case. I'm also experimenting with not allowing the computer to sleep (just letting the screen go blank) to see if never sleeping results in never having the visual disturbance.

Ross, I bought my LG 5K in August 2019 and when I went digging back through the box, it does have a "USB-C" cable as well that is labeled "MacBook / iPadPro". After unplugging the Thunderbolt 3 cable and reconnecting the LG 5K to the M1 Mac Mini using this "USB-C" cable, following dre1138's suggestion I looked in under Hardware > USB in System Info and don't see the monitor there. It's still showing under Hardware > Thunderbolt > Thunderbolt Bus 0.

Is there something else I need to change to convince the monitor to use USB-C instead of Thunderbolt?

Same issue: broken double line. Neither LG nor Apple ever heard of the problem! LG offered to merely repair it (it’s brand new!) Apple will send another one. I hope this isn’t happening to everyone with a Mini and the “ultra fine” (not!), but with so many of you here, it is clearly not an isolated glitch.

I agree. It’s odd such a major glitch using the thunderbolt cable slipped through the cracks. It appears to happen regardless of processor/operating system. Using USB-C instead appears to function flawlessly so I’m content with that.

Hello,

I am currently experiencing the same problem with a misaligned column of pixels (the band on my display is about ¼" wide). However, I am working with a new MacPro not an M1 Mini. I am connected with a 6' OWC Thunderbolt 3 cable. I'm using the TH3 cable to specifically get all the resolution possible from the LG Ultrafine 5K.

Just wanted to post and let folks know that it's happening with a machine other than the M1 Mac. Please post any updates to fix this.

Thanks

I experienced this issue when I purchased an M1 Mac at launch. I told Apple HQ about it and returned the MBP and the display (I tried two of them).

I now have a new M1 MBP and would like to purchase the LG 5k display but it seems that this is still an issue. It’s crazy!

Can anyone confirm if the latest Big Sur 11.3 fixes the issue or not? Thanks.

yes the issue is with Big Sur regardless of chipset. The issue with M1 is also that the LG app does not function under rosetta 2 but the display distortion is a Big Sur issue. It's only been out for going onto 8 months...so.....

So LG finally put up the LG Display Manager on the App Store and it works with Apple Silicons...well it works sort of. Meaning: it does now recognize your monitor. Display settings in the app simply open the Apple Display Preference pane. And of course it did NOT release a new version of its now almost 2 year old Firmware. Thus the display distortion issue remains.