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I've recently got a new Macbook with Big Sur and I'm observing some different behaviour compared to my old Macbook with Catalina.

I have an external monitor connected as a secondary display and I have a video player streaming on full-screen on it. When I close the lid, on Catalina my video keeps playing on the external secondary display, however on my new laptop when I close the lid the external display turns into primary, and I'm seeing my laptop's windows rather than the video.

Any ideas what might be causing this?

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  • What player are you using?
    – Tetsujin
    Commented Nov 25, 2020 at 18:18

2 Answers 2

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Again, another stab at the dark here: Either: (Easy route) remove the monitor's cable from the computer/ or manually put it to sleep OR open up your terminal and write the command 'pmset -g'

it will display your current power management settings.

from then on you could try disabling lidwake, acwake or messing around with the gpu switch option(though, honestly i think its only related to either enforcing dedicated or external/separate internal gpu settings ).

Also, try disabling the darkwake option.(which is not listed within pmset's man pages but you can google your way thru understanding it) pmset -c darkwake 0

  • Note: all pmset values require sudo access
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This is, somewhat, by design - you are able to use your laptop as a computer completely independently of its own peripherals; just as you would with a Mac Mini, by simply closing the lid.

The simple answer is to unplug your laptop from the wall outlet, which disables this mode.

See below: https://support.apple.com/en-us/HT201834

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