Brightness issue with LG4K monitor and M1 MacMini

Question

Level 1

8 points

Brightness issue with LG4K monitor and M1 MacMini

Essentially it's like my display isn't actually reflecting the maximum brightness possible even when adjusting brightness via the keyboard and the on-screen brightness indicator shows it at the max. I'm able to fix this by going into System Prefs -> Displays and tweaking the brightness. Even though it shows brightness max there as well, just moving the slider allows the monitor to actually get as bright as possible.

It does this every time the Mac goes to sleep.

Connecting to the display using the Thunderbolt out from the MacMini.

Mac mini, macOS 11.3

Posted on May 27, 2021 11:28 AM

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Answer 1

den.thed

Level 10

90,226 points

May 27, 2021 3:31 PM in response to evanlemmons

Check to see True Tone is available and enabled with that display.

see > https://support.apple.com/en-us/HT208909

Also see > https://support.apple.com/guide/mac-help/change-your-displays-brightness-mchlp2704/mac

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Answer 2

evanlemmons Author

Level 1

8 points

May 27, 2021 2:14 PM in response to WhisperingWempe

So if I turn the brightness all the way up from the keyboard, the monitor is lit like it's only at 50% brightness. If I go into System Pref > Displays the slider is up all the way; it appears to be at 100%. If I grab that slider and move it a little then the monitor actually goes up to 100% brightness.

It's like the monitor gets stuck thinking it's at 100% brightness when it really isn't and messing with the slider makes it realize that somehow.

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Answer 3

hcsitas

Level 6

13,964 points

May 27, 2021 9:14 PM in response to evanlemmons

“It does this every time the Mac goes to sleep.” ??

If an issue even with Mac Sleep disabled, contact LG. It might be across all such LG monitors, I recall another complaint here a while back. If fixable in firmware, LG will do it, otherwise you’re stuck unfortunately. Good luck anyways!

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