Garrel
I think in this case, if you can only have one computer, you will very likely only find something that works on the PC side. Seems like time to just move on from Macs for this use case
BTW, modern Macs even have problems with video output too when using them as a desktop…
For instance, I have multiple comfortable external displays now: Sharp LC-G5C26U (720p VA panel), and Sanyo Z2 projector.
These displays work perfectly with my current setup, but the moment I plug in an M1 Air, they both start causing strain and begin to show strange visual artifacts — even with Stillcolor running, a "null" color profile, and the "8-bit + force RGB output" Mac EDID workarounds.
For example on the Sharp display, large objects rendered by the Mac seem to have bluish glows and occasional color fringing around them that are nonexistent when my good setup is connected. Dragging something around the screen with the M1 connected seems to generate some sort of motion blur effect, consistently leaving much more noticeable ghosting trails than usual.
Loading up a "screenshot of macOS" on my good setup connected to the Sharp display, looks totally different than the same screenshot rendered by the Mac connected to the same display. Both are connected with the same cable and resolution. So it's not the font, color scheme etc. causing the issue.
I don't think it's specifically dithering flicker going on here, but more likely a kind of sharpening filter or "contrast enhancement"/post-processing kind of effect the Mac is applying to the output.
So that's why, even for desktop use, nowadays I have to go through a screen-sharing workaround to be able to comfortably use M1 Mac software on an external monitor, lol…