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pshufd

macrumors G4
Original poster
Oct 24, 2013
10,011
14,484
New Hampshire
I had a sleeping issue with my M1 Max Studio hooked up to 3 Dell Ultrasharp 27 inch 4k monitors. 2 U2718Qs and 1 U2720Q. There were two issues: the system would wake up all of the monitors and leave them on until the morning and the system wouldn't sleep automatically. I could manually put the system to sleep though. The system is used as the household NAS, but prior behavior is that the monitors would stay off.

I did some digging around and it appears that Bluetooth could be a factor so I turned it off and that solved the monitors coming on at night problem. But it didn't solve the issue with the system not automatically going to sleep.

Yesterday I replaced one of the U2718Q monitors with a U2723QE and it now sleeps the monitors and stays that way. I don't know if it was a monitor setting, the monitor, cable, devices charging off the monitor but it's nice that it is solved. The old U2718Q is now on my wife's new M1 mini and it sleeps fine on her system. So just some peculiar stuff where a change in hardware fixed it.

I've seen a lot of issues with Apple Silicon Macs, sleep and monitors and they can be rather frustrating but at least this is fixed for me.
 
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