Quote:
Originally Posted by D43m0n
I recognize this too. Although the link suggested above is a good one for starters to get an idea of what macOS allows you to do with your background, it doesn't solve the issue I believe.
From my experience, when you set specific wallpapers for each monitor and you want them to retain, you'd need to shutdown your Mac. A reboot with the monitors attached won't suffice. You need to shutdown your Mac with your monitors attached.
Now, from my experience what I described above works pretty much most of the time with "native" monitors, no DisplayLink monitors. The tricky part with DisplayLink is that it are software/virtual displays that carry a signal over a USB cable to a device that renders it. Typing this I realize it's probably not in the right terms but basically a DisplayLink screen is not running on your builtin video card.
To remember settings you choose in macOS on different screens, macOS needs unique identifiers. EDID is a feature that provides this. Since DisplayLink works a bit differently, mostly in software when creating a virtual screen, there might be issues where a new unique identifier might be generated for a DisplayLink screen. Your macOS thinks it's a completely new screen while in fact your hardware is exactly the same.
Now I'm no technician, but in my years of dealing with DisplayLink issues on various Mac devices this is what I believe going on....
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Why does my Mac desktop background reset after a restart when I am using a DisplayLink monitor? I would be very happy if you could let me know, thanks