> I had this working with multiple X11 servers 20 years ago.
People want to move windows between their screens.
The lack of proper HiDPI support was really starting to become a problem when trying to run Linux on a laptop that isn't from the early 2000s. Fortunately, with wayland, it now seems mostly solved (at least in Gnome and KDE).
Xinerama came with the price of not supporting mixed DPI. It was logically a single screen, just with irregular shape, so all screens had to be same DPI (and bit-depth, but that's not an issue nowadays).
Bit-depth is certainly an issue these days. I've got a 1920x1080 60Hz 8-bit/color 24" monitor and a 3840x2160 144Hz 10-bit/color 27" monitor. Different resolutions, refresh rates, color depths, sizes, and DPIs, on a very modern system.
honestly explain to me, if it's work as perfect as you seen to say, why i never heard about it outside of openbsd, why any distro adoped it to resolve it Xorg problems
People want to move windows between their screens.
The lack of proper HiDPI support was really starting to become a problem when trying to run Linux on a laptop that isn't from the early 2000s. Fortunately, with wayland, it now seems mostly solved (at least in Gnome and KDE).