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I'm using a MacBook Pro 2016 with touchbar running High Sierra. I've got an external display connected over HDMI to a usb-c dongle (Apple's).

When I put the laptop to sleep, the monitor continuously cycles between waking up, displaying "no signal" view, and sleeping for a few seconds.

What's the best way to debug/fix it?

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  • More than likely, your issue is that you’re using a passive adapter and not an active one. See my post on active vs. passive for more details.
    – Allan
    Apr 12, 2019 at 19:29
  • @Allan I'm using the Digital AV Multiport Adapter from Apple, which I'm pretty sure is an active one.
    – viraptor
    Apr 13, 2019 at 20:18

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