MacBook Pro turns itself on with external monitor

cosrocket

macrumors regular
Original poster
Jul 7, 2008
132
7
I connected my 13 inch MacBook Pro to a Dell monitor via USB-C on the MBP to USB-C on the monitor (not using the power cord from the MBP, letting the monitor power the MBP) and when I shut down the MacBook Pro after a few seconds it turns itself on again. It doesn’t matter which USB-C port I use on the MBP, it won’t stop turning itself on when connected to the monitor. Does anybody have any idea how I can get it to stay off without having to unplug it from the monitor? I don’t turn off the external monitor, it goes to sleep. Should I have to turn off the monitor to stop the MPP from powering on?
 
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Porkchop Sandwich

macrumors regular
Feb 3, 2017
243
133
I don't have an answer for you but, are you talking about a complete shut-down of your mbp and it's restarting, or are you saying it's coming out of sleep persistently when connected to the monitor (the mbp wakes)? I ask b/c my 13mbp won't stay asleep when connected to an LG 5K and I haven't any idea why either. Do you have 'wake for wi-fi network access' in energy saver turned on (I don't)?

In my case, it doesn't matter whether I sleep the computer via hot corner or through the  dialogue.
 

cosrocket

macrumors regular
Original poster
Jul 7, 2008
132
7
I don't have an answer for you but, are you talking about a complete shut-down of your mbp and it's restarting, or are you saying it's coming out of sleep persistently when connected to the monitor (the mbp wakes)? I ask b/c my 13mbp won't stay asleep when connected to an LG 5K and I haven't any idea why either. Do you have 'wake for wi-fi network access' in energy saver turned on (I don't)?

In my case, it doesn't matter whether I sleep the computer via hot corner or through the  dialogue.
I’m talking about after a complete shutdown.
 

Porkchop Sandwich

macrumors regular
Feb 3, 2017
243
133
Can't say I've had that problem, that's strange. Sorry for the hi-jack..it resonated due to my seemingly similar problem.
 

Patcell

macrumors 6502
Aug 8, 2016
432
182
Bergen County, NJ
That's odd... I will test with my Dell monitor to see if my computer boots from shutdown. It's not apples-to-apples so to speak as mine is connected via DisplayPort to my 2017 Pro rather than straight USB-C.

I do however have a similar issue as the previous poster... my computer will NOT stay asleep when connected to the monitor. It wakes every couple of minutes, which is absolutely infuriating to me and basically forces me to unplug the display every time I put the computer to sleep. I have both 'Power Nap' and 'Wake for network access' disabled, but it makes not difference whether these settings are on or off.

This did not ever happen with my 2014 Pro.
 

jerryk

macrumors 601
Nov 3, 2011
4,917
2,441
SF Bay Area
Isn't this normal behavior?

I assume the monitor's USB-C connector supplies power. If I shutdown my MBP, it will boot up if the display is open, that is a display is available, and I plug in my USB-C power supply.
 
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Porkchop Sandwich

macrumors regular
Feb 3, 2017
243
133
Isn't this normal behavior?

I assume the monitor's USB-C connector supplies power. If I shutdown my MBP, it will boot up if the display is open, that is a display is available, and I plug in my USB-C power supply.
From what I can gather, op is saying that when the mbp’s connected, and it’s shut down and left setting in place, it will spontaneously re-start with no further interaction with any of the hardware. If so, it shouldn’t do that. The only I thing I can think of, beyond handling the hardware while it’s powered down and at the ready for re-boot, is if there’s a cut to power (like a power strip or interruption from the power co. or something). Even then, I ‘think’ there’s a setting allowing the user to opt out of that reaction to a power interruption (ie; re-start)? op, is that a possibility (interrupted power somehow)?
 

cosrocket

macrumors regular
Original poster
Jul 7, 2008
132
7
From what I can gather, op is saying that when the mbp’s connected, and it’s shut down and left setting in place, it will spontaneously re-start with no further interaction with any of the hardware. If so, it shouldn’t do that. The only I thing I can think of, beyond handling the hardware while it’s powered down and at the ready for re-boot, is if there’s a cut to power (like a power strip or interruption from the power co. or something). Even then, I ‘think’ there’s a setting allowing the user to opt out of that reaction to a power interruption (ie; re-start)? op, is that a possibility (interrupted power somehow)?
Yes that is exactly what is happening. I always leave my monitor on and it just goes to sleep when I shut down the MBP. Before I got this monitor I was connected to my previous monitor with a display port to usb-c cable and let the MBP be powered from the power cord, with that setup I didn't have this problem. The nice thing about usb-c to usb-c supposedly is that the usb-c cable powers the MBP so you don't need the power cord. But now I have this issue where the MBP will not stay powered off.
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From what I can gather, op is saying that when the mbp’s connected, and it’s shut down and left setting in place, it will spontaneously re-start with no further interaction with any of the hardware. If so, it shouldn’t do that. The only I thing I can think of, beyond handling the hardware while it’s powered down and at the ready for re-boot, is if there’s a cut to power (like a power strip or interruption from the power co. or something). Even then, I ‘think’ there’s a setting allowing the user to opt out of that reaction to a power interruption (ie; re-start)? op, is that a possibility (interrupted power somehow)?
I have the monitor connected to a battery backup but it’s always on and I never had a problem with it. With the MBP just connected to the monitor via usb-c it is no longer connected to the battery backup directly.
 

Painter2002

macrumors 65816
May 9, 2017
1,080
756
Austin, TX
I connected my 13 inch MacBook Pro to a Dell monitor via USB-C on the MBP to USB-C on the monitor (not using the power cord from the MBP, letting the monitor power the MBP) and when I shut down the MacBook Pro after a few seconds it turns itself on again. It doesn’t matter which USB-C port I use on the MBP, it won’t stop turning itself on when connected to the monitor. Does anybody have any idea how I can get it to stay off without having to unplug it from the monitor? I don’t turn off the external monitor, it goes to sleep. Should I have to turn off the monitor to stop the MPP from powering on?
What model year MacBook Pro do you have? If you have the 2018 model, is it possible you are hitting any other key on the keyboard after shutting it down? I know on that gen pressing any key on the keyboard will cause the computer to restart.

If that’s not the case it certainly is peculiar and should not be rebooting. My 2017 MBP is connected to 2 Dell Ultrasharp monitors and does not do this at all.