Temporarily Prevent Display Sleep with a Hot Corner M1 Mac laptops choose “Power Adapter”, and then drag the slider for “Turn Display Off After…” to “Never”.Choose “Battery” (M1 MacBook Pro, M1 MacBook Air), or “Energy Saver” (M1 Mac Mini, iMac).Open System Preferences from the  Apple menu.You can do this a few different ways: Completely Disable External Display Sleeping on Mac Preventing the display from going to sleep also prevents the display flickering problem. If the display won’t wake at all, forced restarting the M1 Mac seems to temporarily fix the issue (until it is put to sleep again, anyway). Instead, try the approaches discussed above with disconnecting and reconnecting the cable. Rebooting the Mac also appears to often fix the display flickering problem, but this is annoying and should not be necessary for most Mac users.

Instead, I’ve found disconnecting and reconnecting the HDMI cable from the USB-C dongle adapter itself works. Variation: Disconnect/Reconnect display cable from dongle (not from Mac USB-C port)įor my own M1 MacBook Pro, simply disconnecting and reconnecting the USB-C dongle adapter from the Mac does not resolve the display flickering or white noise issue. This will cause the M1 Mac to refresh its own display, as well as the external display, which typically resolves the problem immediately. If the external screen is flickering or displaying white noise, you can try to disconnect and reconnect the cable while the Mac is powered on.

There are a few fixes and workarounds to external display issues with the M1 Macs, here’s what you can try if you are experiencing these problems: Disconnect and reconnect display cable How to Fix External Display Issues with M1 Mac Some users have reported success with using a USB-C to HDMI or USB-C to DisplayPort cable with the M1 Mac, instead of a dongle or adapter, but that does not resolve the problem for everyone. This issue seems to exist regardless of which dongles, display connectors and adapters, or display cables are used, and whether or not it’s a compatibility issue between the M1 Mac series and certain external displays, a bug with macOS that has yet to be resolved, or some other problem, is not yet clear. If you’re experiencing external display issues with an M1 Mac, read on to learn about possible fixes and workarounds to the display flickering, white noise showing, black screens that won’t wake, or other similar issues.

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