The wayland protocol solve this. I do think that at least gnome 3.34+ and wlroot based window managers support this, but it needs to be confirmed as i don't hav

The wayland protocol solve this. I do think that at least gnome 3.34+ and wlroot based window managers support this, but it needs to be confirmed as i don't have this setup and just used ratios on same dpi monitors. Not sure how it works with X based app also that are run through xwayland.