Level 1

21 points

M1 Mini issue with LG 27" 5K Monitor

I have a new M1 Mini running the LG 5K monitor from they Apple store. The monitor is recognized with the 5120 x 2880 resolution spec on boot or monitor reset (unplug and reinsert thunderbolt cable), but invariably falls back to a 3840 x 2160 resolution when the monitor goes into screen saver or sleep.

Three different thunderbolt cables have be used, a second LG Monitor tried, and have tried both Thunderbolt ports on the mini. A replacement Mac mini seems to be the last resort, but I feel this may be a bigger issue affecting others, and that a replacement will not fix this.

Is anyone running this monitor with Big Sur or ideally with the M1 Mini?

Posted on Dec 11, 2020 5:36 PM

Top-ranking reply

Chris Wilhoite

Level 1

9 points

Posted on Jan 17, 2021 6:39 PM

thoughts,

I called Apple Saturday and started a case. Talked to a senior tech person for a while. Went over everything. Told her about these threads in the forum. She had me set the energy saver to never. Thinking that this would push it to occur. The interesting thing is since changing it, it has never occurred. Makes me think that going into sleep may be what is causing it. WHY, I do not know.

I did see that there are 3 threads about this and on one someone mentioned they could make it happen by setting a hot corner to sleep monitor.

She also wanted me to try using the USB-C cable supplied by LG and see if it still happens. Have not tried that yet as I am seeing how long it will go without messing up by sleeping monitor being set to never.

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100 replies

Jan 24, 2021 2:23 PM in response to K9x3

I have this pixel shift issue too :-/

I use a Mac mini M1 with a LG 5K Display (27MD5KL, 2nd Gen) connected via Thunderbolt cable.

vippiv

Level 1

10 points

Mar 10, 2021 7:03 AM in response to TBrown313

And my experience too... brand new M1 Mac Mini (less than a week old) and LG 5k display (three weeks old), same vertical pixel shift problem.

earns

Level 1

4 points

Mar 13, 2021 1:58 AM in response to Chris Wilhoite

Works for me since two days. Sorry for double posting...

Apr 16, 2021 9:34 PM in response to Ross Ellingson

Tried the TB 3 Pro cable from apple, the issue still persists.

May 9, 2021 8:15 PM in response to K9x3

Did the new Mac mini help with the LG monitor problem?

WolfA1

Level 1

4 points

May 28, 2021 7:47 PM in response to K9x3

So is there going to be an actual fix to this? Apple?

Jun 30, 2021 5:10 PM in response to earns

Hi Earns

Now, uour vertical shift problem is solved with your solution ?

Best

Yaya

MEADEN

Level 1

15 points

Dec 24, 2020 11:18 PM in response to K9x3

No, it still happens from time to time despite having upgraded to 11.1. I have a "hot corner" set up in the bottom right to "Put Display To Sleep", and if I see the problem - drop the cursor down there, then tap the Trackpad a couple times and the Mini unlocks (thanks to Apple Watch) which always seems to reset the problem.

Dec 29, 2020 11:22 AM in response to MEADEN

I have this problem too - that is: a strip down the middle of the ultrafine 5k that is offset by a pixel or 2. It is strikingly centered on the camera which makes me think its an apple sw problem.

Along with that my second monitor (LG ultrafine 4k) is connected by HDMI. Ive set the computer to not sleep when displays are off, which pretty much solves the waking problem. I am also seeing that upon wake or reboot, this monitor does not remember the scaling and HDR settings I've entered in System Preferences.

If I see any change to these I'll repost back here. I am really avoiding calling support until I get to see 11.3, which I've read elsewhere is supposed to be addressing some graphic issues.

K9x3 Author

Level 1

21 points

Dec 14, 2020 4:36 PM in response to Douglas Holschuh

Apple released a Big Sur update (11.1) that specifically listed this issue in teh update.

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M1 Mini issue with LG 27" 5K Monitor