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

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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

K9x3 Author

Level 1

21 points

Mar 10, 2021 7:19 AM in response to vippiv

Thanks for the update. I still have the issue and think it is specific to the 5K resolution. The same monitor at 4K does not have the issue. It will be interesting if the issue has happened with a 5K iMac. I attempted open a case with LG, and it has set idle. I need to renew it with them. LG has historically not been very responsive. The hot corner workaround makes living with teh issue easier.

K9x3 Author

Level 1

21 points

Mar 14, 2021 1:47 AM in response to greyday records

I found the LG Screen Manager from the App Store does not work on my M1 Mini. It does not see a monitor attached. Did you use the LG screen manager as a download from LG?

I didn't realize LG had a 34" 5k monitor. Does it connect using thunderbolt?

Thanks

WolfA1

Level 1

4 points

May 28, 2021 10:25 PM in response to earns

Thanks, I shall set up a hot corner then.

Seems like companies are getting away with their products not working the way they’re expected to more these days though. You would think Apple, as detailed and customer oriented as they, are would at least care enough to try and address the issue. The monitor is still being sold on their site…with this annoyance not appearing as a known issue. Thought I was getting a bad arse 5k monitor, instead I got a bad arse monitor that occasionally annoys me.

earns

Level 1

4 points

Jun 30, 2021 8:38 PM in response to killahyaya

No. But it occurs more seldom. May be after LG enabled the LG Screen Manager app to run on an M1 Mac, they decide later to update the firmware? Seems that we have to wait. I decided to live with it... :-(

MEADEN

Level 1

15 points

Dec 24, 2020 11:25 PM in response to MEADEN

Here is a photo of the problem - if I screenshot, you can't see the problem - everything lines up.

MEADEN

Level 1

15 points

Dec 25, 2020 6:19 PM in response to K9x3

That is precisely where mine is too. Let me know if the replacement Mac mini does the trick, and I'll hit up Apple for same.

Dec 29, 2020 2:24 PM in response to K9x3

No that’s not correct. It is not limited to the mini. I have a MacBook Air M1 and I have the same problem as well.

Dec 29, 2020 2:23 PM in response to K9x3

Screenshots are fine. Screen is identical to yours.

K9x3 Author

Level 1

21 points

Dec 29, 2020 2:55 PM in response to usb_drive

Apologies for any confusion. I got that you had the M1 Air. Are you seeing the pixel shift on the LG 5K monitor connected to it?

Jan 16, 2021 8:15 AM in response to K9x3

am very interested in your update on this. You sound like you've replaced both the monitor and M1 mini. SO.... did that fix the problem OR are you seeing it again with the replacements?

Jan 16, 2021 5:44 PM in response to K9x3

I'm using the original cable and same thing.

Jan 16, 2021 6:02 PM in response to Ross Ellingson

I have a MBP 16” and never had this problem with the 2nd generation 5K LG monitor only with the M1 MBA.

Jan 16, 2021 6:29 PM in response to usb_drive

usb-drive, Is it possible you're connected via USB-C instead of thunderbolt 3 cable?

MEADEN

Level 1

15 points

Jan 18, 2021 4:31 PM in response to usb_drive

Second Gen in my case.

K9x3 Author

Level 1

21 points

Jan 18, 2021 5:50 PM in response to MEADEN

Thanks Meaden, you confirmed my experience with the screen manager software on the M1. Best Regards...

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M1 Mini issue with LG 27" 5K Monitor