I bought Oryx Pro recently which has 3840x2160 resolution.
Do you know how to change in Dom0 Windows, Texts and Icon sizes? Maybe existing some software for this options? Or it could be done in setings somwhere?
Screenshot of my situation: https://drive.google.com/open?id=1V8Yg2nGd5A44laCGwMvAo71kHxb5DCqi
I have had similar experiences and used a tool called "gnome-tweak-tool" to correct the situation (https://www.militant.dk/2018/05/21/qubes-3-2-fedora-26-large-icons-and-large-fonts-on-lenovo-yoga-2-pro-high-resolution-laptop/)
But lately I think it has changed to "gnome-tweaks", so you can try that, if the first package is missing.
Sincerely
Max
Yes, I tried it yesterday and it did not help. I even tried to install Nvidia driver tool (I don't know why :), maybe I believed in magic).
Actually, I cloned today new VM on Debian 9 and tried again with your Github guide and it works.
"
echo Xft.dpi: 144 | xrdb -merge
set in /etc/X11/Xresources/x11-common
Xft.dpi: xxx
"
I don't know what was been the reason the first time, because I did the same things.