I just updated from a 2014 Mac Mini to a 2020 Mac Mini for work. When the old computer was connected to this monitor, everything looked great (connected via display port).

Now when I connect the same monitor to the 2020 Mac Mini (via HDMI), it looks pixel-y, and the windows and text look a little larger than they should.

In System Preferences > Display, the resolution that the computer reports is correct for the monitor (1920x1080) and none of the other resolution options make it look any better, even after viewing the additional resolution options by pressing 'option.' I've already tried rebooting the computer and rebooting the monitor separately. Edit: I also tried resetting the display settings using the Cmd+Opt+P+R combo on startup and that didn't help either.

I don't have any other cables on hand to check if the HDMI cable is the problem, but I just bought this one. What else can I try?

As a side note, I'm also having problems with the keyboard. During setup I had to go through a process of keyboard identification, but now my 'control' or command key is not working as it did before.

Any help would be appreciated.

  • What OS are you using, and what were you using? What model is the monitor? There has been a change in how macOS draws on non-Retina displays that can make them look at bit not-good. I think the keyboard is another question.
    – benwiggy
    Jun 22 at 18:17
  • It's Big Sur 11.3.1 and the monitor says Planar PXL 2780MW. I'm currently in the process of using homebrew to change the resolution mode--not sure if that's the right approach (github.com/jakehilborn/displayplacer). Jun 22 at 19:30

That monitor has a native resolution of 2560 x 1440 at 27". (Same as the Apple Thunderbolt Display.)

So you should be able to achieve that resolution from your Mini. You might want to try USB-C/Thunderbolt 3 to DisplayPort, rather than HDMI. (Though it's certainly within the 4096 x 2160 pixel limit of the Mini on HDMI.)

However, it has a pixel density of 109 pixels per inch. That's half the density of 'Retina' display MacBooks, which is the standard that Apple is basing its graphics on, so you may get some lack of clarity.

I have an Apple Thunderbolt Display on a 2018 Mini, as it's still very usable.

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