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It seems to be an issue when using DisplayPort. If I switch from DP to a DVI cable, this does not occur. icons are moved, open apps are moved and resized to fit on the new primary monitor). However, if I power off the primary monitor, it is disabled completely as if it were unplugged from the graphics card (i.e. I often leave my computer running overnight (working on long render job, doing backups, etc) so I only power off my monitors manually.

Right is 2560x1440 via DisplayPort and is set to Primary (Samsung SyncMaster SA850).

Left is 1920x1080 via DVI (Samsung SyncMaster 2443BW).

No problems with purple pixels on the monitor or continuously switching the screen on and off.I have 2 monitors connected to a NVIDIA GeForce GTX 660: This was the ONLY cable that worked really well. It only costs about в‚¬ 12,00 at the Dutch ' Bol.com' (just for reference See: В ) It is described as 'High Speed HDMI cable with Ethernet'. So after buying a few new cables I found one specific cable from Philips that worked perfect.

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However, I still was not happy with this heavy Profigold cable on my Mac Mini. The Profigold cable just gave the best results. Tried another couple brands of HDMI cables with various results. So I put the Profigold cable back and again 'no problemo'. Monitor screen switching on and off al over sudden, etc. So I decided to go for a lighter HDMI cable.ДЄnd then the problems began. BUT, this Profigold cable is a very thick cable, about 1cm diameter, and I was afraid that this heavy cable might ruine the internal HDMI connector of my Mac Mini M1. Perfect picture and no problems whatsoever with the monitor. I used an expensive 'state-of-the-art' HDMI Cable from Profigold which I had left from my audio set. I received my Mac Mini M1 about a month ago (end of June). This resolution is available to me with DP but not HDMI. I'm trying to target a scaled resolution of 3008 x 1692 which is just about the Goldilocks resolution for me in terms of readability. With HDMI the system reports a native resolution of 5K (5120 x 2180), and with DP it (occasionally) reports 6k (6016 x 3384). For whatever reason the scaling options are different for HDMI and DP, and neither are reporting the correct native resolution for this monitor in the System Report (4k, 3840 x 2160). There are USB 3 upstream/downstream ports, but I'm not using them. This monitor does not let you select HDMI or DP versions (it supports HDMI 2.0/HDCP 2.2 or DP 1.2). The only setting on this monitor available to me that has anything to do with i/o (besides simply selecting an input) is DDC/CI, which I've turned off since the M1 doesn't support it anyway. Not sure which settings on the monitor you are referring to. I'm trying it with the screensaver turned off and login screen (password) disabled to see if that improves the situation. The problem was resolved but returned after a while when it went to screensaver. I have sleep turned off (computer and display). Wondering if I should just return it and wait for the bugs to get worked out. It's a bummer because it's a great performer in every other respect.

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The only way to resolve this is a full restart.ДЇeel like I might be getting burned by jumping in early on another first-gen Apple product that's not quite ready for the public. The lines persist even after the video is closed. Lastly, displaying video fullscreen in 4k introduces tiny vertical lines (every other pixel maybe?) and brightness flickering. Again, never an issue with the Intel MacBook I had used with this monitor up until now. When set to 'Default for display' the system report correctly detects the monitor as 4k. This has the effect of doubling the size of everything (too big) rather than increasing the size by a third (just right). When the display is set to scale to 'appear like 1440' (my preferred setting for this monitor) the System Report is showing the Mac is incorrectly detecting the monitor's native resolution as 5k. Connecting through HDMI introduces another issue.Unless there a fix in the works, DP is a no-go for now. Unfortunate, because I'd prefer DisplayPort over HDMI. There is no issue with the USB/DP cable, as it works perfectly with my MacBook and a Dell laptop I've tested it with. Powering off the monitor does nothing to resolve the issue, it has to be unplugged from the wall. If the Mac sleeps and is awakened, the issue returns. When connected through USB-C -> DisplayPort the screen flashes to black every 1 or 2 seconds and continues to do so until the monitor is unplugged for about 30 seconds and plugged back in.

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I've had this Mac Mini for 24 hours and I'm already running into an assortment of display issues, none of which were issues with the 13' MacBook Pro (Intel i5, 2020) that I previously had displayed to this monitor.