Unable to wake my computer using the keyboard in clamshell mode after update to Sonoma

In my case the MacBook Pro '21 (MB) is charging according the battery icon in the status bar. However, the MagSafe 3 charger LED in the connector remains red iso green during charging.

Anyway, still while charging, clamshell mode does not work. When closing the lid, the external display which is connected through HDMI, enters standby mode. So no video signal is coming from MB.

Replacing the MagSafe 3 charger with a USB-C charger doesn't show any difference. Closing the lid still brings the external display into standby mode.

Thanks AlleOop,

I tried your procedure. Doesn't work for me.

How would the MacBook charger be related to the external display which is supplied from the grid directly?

(btw I use the charger supplied with the MB)

I am having a similar issue with my Intel Macbook Pro 16".

Previously when on Ventura, I would be able to come into the office plug in the laptop to my Anker Docking Hub and it would automatically power on and the display would turn on.

Since upgrading to Sonoma, while my laptop is shut down, I plug it into my dock the laptop will not power on by itself anymore. It will show the Battery icon on my external display and then the display turns off. After upgrading to Sonoma, I now have to open the lid, wait for the laptop to power on, close the lid, then plug it into the hub. From there, the clamshell mode works fine.

It is a small thing, but very aggravating when for the longest time, I could simply plug in my laptop and it would power on. I have tried searching for this issue for months now and I cannot find anything about it. I feel like I am the only one facing this issue. I have tried a fresh install as well, but sadly that did not help. I have also tried to go through my NVRAM settings and PMSET settings, but again have had zero luck!

Not sure if anyone here has been facing the same thing, but I am hopeful that someone ran into this issue and has resolved it.

Thank you all!

I'm having this issue, but in a different way. Clamshell mode works great! My problem is when I'm using my MB 2019 as a mobile laptop. When I close the lid, it DOES NOT go to sleep. Keys get pressed as I move around, and the volume gets increased to full. This drains my battery, and causes clicking on applications or closing apps. I've tried everything with no luck. I've removed displaylink, but same thing.

'clamshell mode' requires connection of the Power Adapter, an external display, an external keyboard, and a pointing device.

If yours in not sleeping when you are closing the lid with no power adapter and no external display, you have a 'not sleeping' problem, not a 'clamshell' problem.

There are many things that can preclude sleep, especially active software. But your query is now buried, two pages deep on a discussion on a somewhat different subject. You would be better served if you started a NEW discussion with a Title that might attract readers who are familiar with sleep issues.

this worked! I dont know how you knew how to figure this out, but this is genius! One thing to note. Make sure your mouse is right over that "Detect Displays" button - for me that did the trick. Can't believe this actually worked and for the first time in years my Macbook Pro can be used completely closed in clamshell mode

Unfortunately this procedure doesn’t work in my case. Thx anyway for the detailed description!

Ah, that’s unfortunate. Hopefully it can help someone else!

Wow the procedure works for me. Thanks Kadzzzy!

Really glad to hear that! You're welcome!

Thanks this helped.

This one worked for me using DP. Thanks!

You are a saviour my guy. struggled with this problem for nearly 6 months now. I'm glad that its sloved now and thank you very much for your input.

greetings from Bharat.