M1 iMac with LG 5k External Monitor Issues.

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Level 2

368 points

M1 iMac with LG 5k External Monitor Issues.

I have my LG 5K display connected to my M1 iMac using the Thunderbolt cable that came with the monitor. I have two issues: When I wake the Mac from sleeping the LG takes about 4 seconds to wake. Is there a way to make it wake faster? And, about 70% of the time it's much dimmer than it was when the Mac went to sleep. The Display brightness setting bar is at the same setting as it was previously, and all I need to do is click the "dot" on the bar to get the display to brighten again. Is there a way to fix this?

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Posted on Oct 24, 2021 8:33 AM

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Answer 1

Bruce Kieffer Author

Level 2

368 points

Oct 24, 2021 1:16 PM in response to VikingOSX

VikingOSX wrote:

I have an LG 32UN880-B 4K display that has deep sleep, so when I shut down my M1 mini, the display turns off but does not power completely down. I believe this is configurable through the LG display controls, but it's the way I have it now.

In the morning, when I power on the mini, the LG takes a few seconds to come out of deep sleep and by the time it does, I have the Mac mini sign-in display.

The LG 5K display may have controls that can resolve your delay, or not.

The LG 5K UltraFine display does not have any controls other than "standard" in sys prefs.

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Answer 2

tbirdvet

Level 6

14,795 points

Oct 24, 2021 11:25 AM in response to Bruce Kieffer

I have the same issue of the LG monitor being dimmer after waking from sleep using my Mac Mini M1. One can just use the brightness keys to readjust but I now just turn off sleep and use only screen saver and at night I auto shut down and auto start in the morning. I also have the delay from wake. Perhaps it is the LG monitor or just a Mac M1 issue.

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Answer 3

Oct 24, 2021 11:31 AM in response to Bruce Kieffer

I have an LG 32UN880-B 4K display that has deep sleep, so when I shut down my M1 mini, the display turns off but does not power completely down. I believe this is configurable through the LG display controls, but it's the way I have it now.

In the morning, when I power on the mini, the LG takes a few seconds to come out of deep sleep and by the time it does, I have the Mac mini sign-in display.

The LG 5K display may have controls that can resolve your delay, or not.

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Answer 4

Bruce Kieffer Author

Level 2

368 points

Oct 25, 2021 5:58 AM in response to hcsitas

hcsitas wrote:

Disable Sleep, it’s not necessary. Check “Prevent…” in Energy Preferences and uncheck everything else. Leave the setting to switch display off on timer as is, unrelated to Sleep.

Doesn't that delete the energy saver and never allow the Mac to sleep?

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Answer 5

Bruce Kieffer Author

Level 2

368 points

Oct 28, 2021 6:04 AM in response to hcsitas

Not putting the Mac to sleep is an option, but notification sounds keep playing, and I don't want that. I cannot finds a way to turn them off while the screen saver is running.

Intalling Monterey did not help. I called Apple support. No help at all. I called LG support. Heck they had no idea what motor I was talking about!

This is a mess which I am 99% certain is a software bug with the OS and M1 Macs since all worked fine for many years using this LG 5K display connected to my MacBook Pro.

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Answer 6

Bruce Kieffer Author

Level 2

368 points

Oct 28, 2021 6:19 AM in response to hcsitas

hcsitas wrote:

That’s a different problem, post separately with details please. This one appears solved (even if you’re hesitant to admit).

What is the "different" problem you refer to? And I don't consider this problem solved.

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Answer 7

Bruce Kieffer Author

Level 2

368 points

Oct 28, 2021 8:26 AM in response to hcsitas

That's a reason why for me not sleeping the Mac does not work. I want to be able to sleep my Mac with an external display connected and have it wake up properly. Even if I could turn off sounds when the screen saver is on, that does not solve the problems with my external display misbehaving on Mac wake up.

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Answer 8

hcsitas

Level 6

13,232 points

Oct 28, 2021 8:33 AM in response to Bruce Kieffer

As already mentioned, Sleep is for energy saving, n/a to later Macs. So the wake issue is solved by disabling it. Sleep isn’t for disabling notifications. Post a separate discussion on that, it can probably be solved.

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Answer 9

Bruce Kieffer Author

Level 2

368 points

Oct 28, 2021 5:14 PM in response to Bruce Kieffer

I've been thinking that screen sleep and Mac sleep are the same, but in the settings it appears they are not. I've done more testing. The "Turn display off after;" is causing my problems. When I set that to "Never" then things are fine. I'm testing Focus as a way to stop notifications when the screen saver is active.

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Answer 10

Bruce Kieffer Author

Level 2

368 points

Oct 24, 2021 5:06 PM in response to Bruce Kieffer

I hope this is fixed in Monterey.

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Answer 11

hcsitas

Level 6

13,232 points

Oct 24, 2021 8:59 PM in response to Bruce Kieffer

Disable Sleep, it’s not necessary. Check “Prevent…” in Energy Preferences and uncheck everything else. Leave the setting to switch display off on timer as is, unrelated to Sleep.

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Answer 12

hcsitas

Level 6

13,232 points

Oct 25, 2021 6:02 AM in response to Bruce Kieffer

Yes, but energy savings lost are negligible in later Macs, otoh headaches gained aren’t, unfortunately. So, best to disable Sleep and for long absences (measured in days or half-days), shut.

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