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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