It's 2020. I've been sitting in front of two 4k monitors for perhaps five years now, under Ubuntu Mate. Every month or so an HN comment implies it doesn't work. ;-)
So many years of people telling me that my exact setup does not work, yet here I am not remembering the last time I had an issue with displays on Linux. It has even gotten _better_ since I moved to Wayland which I am also told does not work.
To be fair, the last time I did was when I bought my current monitor, this year. 2560x1440, and only works properly when I log in so my X config loads.
I messed up some PAM config shortly after, and had to chroot to fix it - couldn't read a single letter I was typing (impossibly small and distorted for the number of pixels used to display them, character widths all over the place too) but manager to get it done, very carefully and slowly...
I probably should've made getting it working system wide a priority after that (maybe it's as simple as I used my user config rather than /etc, I can't remember) but I haven't. I suppose worst case I could use a different older monitor anyway.
Agree - been using 4k monitors with Fedora for years as well, and whilst there's still a few warts it's been steadily getting better and is perfectly usable.
Looking forward to seeing Gimp with native support though
