Having Mac Mini M1 and a HP Z34c G3 monitor with a Thunderbolt 3 connection.
When I restart (which I sometimes do but not often) the monitor has the right resolution (3440 x 1440) but is greenish as if the colours don't come trough correctly.
I have to change resolution in the System Settings and put it back on 3440 x 144O to fix this.
Just a small annoyance but has someone a perpetual fix?
Mac OS Ventura all versions, every update did not fix this
Mac mini
Thanks for posting in the Apple Support Communities LucThomaere,
The following sections provide some information that may be helpful:
Check cables and connections
Make sure that your external display's power cable and video cable are connected securely and correctly at both ends. Learn more about how to connect a display to your Mac.
Your external display will be dark or use a lower resolution or refresh rate if your video cable or any adapter you may be using with it doesn't support the resolution and refresh rate of the display. If you're using a Thunderbolt or USB-C adapter, it must also be compliant with DisplayPort Alt Mode, Thunderbolt 3, or Thunderbolt 4.
Update software
Software can affect display detection, the quality of the image on your display, and the resolutions and refresh rates available to your display.
* Install the latest macOS updates, which also deliver firmware updates for displays made by Apple.
* If your display is not made by Apple, make sure that it's using the latest firmware from the manufacturer. Check your display's documentation or the manufacturer's website for details.
If your external display is dark or low resolution
We hope this helps!
HP Z34c on a Mac Mini M1
