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 #TV WHITE NOISE SCREEN SAVER HOW TO# 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. This will cause the M1 Mac to refresh its own display, as well as the external display, which typically resolves the problem immediately. 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. Instead, I’ve found disconnecting and reconnecting the HDMI cable from the USB-C dongle adapter itself works. 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, try the approaches discussed above with disconnecting and reconnecting the cable. 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). 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. Open System Preferences from the Apple menu.Choose “Battery” (M1 MacBook Pro, M1 MacBook Air), or “Energy Saver” (M1 Mac Mini, iMac).M1 Mac laptops choose “Power Adapter”, and then drag the slider for “Turn Display Off After…” to “Never”.Temporarily Prevent Display Sleep with a Hot Corner Install MacOS Software Updates when available Setting up a Hot Corner and choosing “Prevent Sleep” as the Hot Corner configuration, then remembering to throw the mouse cursor into that corner, will prevent sleep when used. Though this issue persists with modern macOS versions (including macOS Big Sur 11.4, macOS Big Sur 11.5, and macOS Monterey for some users), installing the latest available macOS system software updates may resolve the problem eventually, particularly if it’s a bug that Apple has fixed. You can update macOS system software through Apple menu > System Preferences > Software Update.Ī previous issue with the M1 Mac Mini having issues with displays not waking from sleep was apparently fixed with macOS Big Sur 11.3, but some users still experience the problem with later macOS versions, or variations of the issue (flickering screens, white noise, monitor stuck on black, etc), and with other M1 Mac models.
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