External monitor cycles on and off when connected to a dock even when Macbook Pro is sleeping

I'm having a minor issue with an LG 27UN850-W monitor, Razer Thunderbolt 4 Dock, and a Macbook Pro 2021. The monitor keeps powering on when the Macbook is asleep because it detects a power source from the dock when the Macbook is connected. It goes back to sleep shortly after when it doesn't receive a signal. It's connected via a USB-C to DisplayPort cable. The other monitor does not have this issue.


This is concerning because it will continue to cycle on and off until the Macbook is shut down or disconnected. I can also disconnect the monitor every time I put the Macbook to sleep but that is counterproductive. I've tried using features on the monitor such as deep sleep mode, but none work.


Is there a way to disable power/connectivity to a specific peripheral when the Macbook is asleep? If not, is there a way to disable power/connectivity to all peripherals when the Macbook is asleep?

MacBook Pro 14″, macOS 12.0

Posted on Nov 25, 2021 7:44 AM

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Nov 26, 2021 10:25 AM in response to Yungyyyy

Hello Yungyyyy! Thank you for participating in the Apple Support Communities.


We understand that your external display is powering on while your Mac is sleeping. We'd like to look into this with you to see how we can help. 


It’s possible that you may need to check with LG Support to look into the setting for your monitor, but let’s check the steps provided by Apple in the following article: 


If your Mac sleeps or wakes unexpectedly


It’s possible that your Mac may be waking unexpectedly from sleep. 


Make it a great day!



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External monitor cycles on and off when connected to a dock even when Macbook Pro is sleeping

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