Mac mini M4 keeps resetting/unrecognising display settings after turning off

Whenever my Mac mini M4 falls asleep or shuts down and I turn it on again the display settings change. The monitor I have is a Samsung Odyssey G4. It seems like it unrecognised the display as the colour profile changes, brightness cannot be increased or decreased and I can only set it to 60Hz even though my monitor supports 240Hz. The issue resolves itself when I remove and reinsert the HDMI. Is this a bug which can be fixed through an update or is there a setting I may need to change?

Posted on Mar 29, 2025 8:33 AM

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den.thed

Level 10

90,916 points

Posted on Mar 29, 2025 8:58 AM

If you are using one of the Samsung supplied cables or a low grade HDMI cable.

Replace that HDMI with a short high speed 8K 2.1 HDMI cable.

for example: https://www.amazon.com/dp/B08M9HND4F/ref=sspa_dk_detail_0?

Or.... a short 8K USB-C to DisplayPort 1.4 high speed cable.

for example: https://www.amazon.com/dp/B0BXLDJV3Y/ref=sspa_dk_detail_3?

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3 replies

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den.thed

Level 10

90,916 points

Mar 29, 2025 8:58 AM in response to hwil12

If you are using one of the Samsung supplied cables or a low grade HDMI cable.

Replace that HDMI with a short high speed 8K 2.1 HDMI cable.

for example: https://www.amazon.com/dp/B08M9HND4F/ref=sspa_dk_detail_0?

Or.... a short 8K USB-C to DisplayPort 1.4 high speed cable.

for example: https://www.amazon.com/dp/B0BXLDJV3Y/ref=sspa_dk_detail_3?

den.thed

Level 10

90,916 points

Mar 29, 2025 9:16 AM in response to hwil12

Yes 2.0 has a much lower bandwidth than 2.1 and these new Mac's are picky.

https://www.avaccess.com/blogs/guides/hdmi-2-0-vs-2-1-difference/?

Personally I would move that display to an 8K USB-C to DisplayPort 1.4 cable.

hwil12 Author

Level 1

4 points

Mar 29, 2025 9:04 AM in response to den.thed

I'm using an HDMI 2.0 cable would this be considered as low grade?

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Mac mini M4 keeps resetting/unrecognising display settings after turning off