Some customers who have purchased an M1 Mac mini have experienced an issue that causes the computer not to wake a connected third-party monitor from sleep mode.
This is not a problem that affects all owners of M1 Mac mini, but there are many complaints about MacRumors forums and Apple Support Communities from November when Mac mini was first released. MacRumors reader gooimac explains:
My M1 (8GB / 256) Mac mini does not seem to wake up my monitors after it has slept. I have tried with 2 different monitors with 2 different HDMI cables with the same thing that occurs on each one. I currently only use one at a time. I also noticed some pink squares / graphics bugs on the Big Sur boot / log in screen (with the colored background, not the black and white boot up)
MacRumors Reader Mike, who emailed us about the issue, has seen the same issues.
I have a new Mac Mini M1 with 16 GB of RAM running Big Sur 11.2.3, and every time the computer and monitor go to sleep, the computer will not be able to wake the monitor.
Actually, I get “No Signal” displayed on the screen after the Mini wakes up so technically that the computer wakes up the screen, but it can not send a video signal. The screen is a 34 “LG Ultrawide 4K Thunderbolt. It wakes up well with my MacBook Pro 2018, so there is nothing wrong with the screen itself.
The only way I can get the Mini to send a signal to the monitor is to disconnect and reconnect the Thunderbolt cable. Sometimes repeatedly. Obviously, this is not an ideal solution.
This problem seems to affect a wide range of monitors connected via Thunderbolt, HDMI and DisplayPort adapters, but there are also many people who do not have problems at all.
It’s not clear what the problem is, but Apple has looked at an issueM1 acMac mini screen problem that causes weird pink squares to appear on screens connected to one of the machines.
Apple is aware of the problem, and it may be a solution to the works that will come in a future update. One solution for now might be to disable the feature that puts the Mac mini to sleep, but that’s not ideal. The other solution is to disconnect and connect to a monitor that does not respond after a acMac mini wakes up from sleep, but it is also an inelegant solution. It seems that there is no other solution available at the moment.