https://bugs.winehq.org/show_bug.cgi?id=49500
--- Comment #12 from Nyxis vld10@yandex.ru --- (In reply to Olivier F. R. Dierick from comment #11)
I'm not familiar with x11vnc or tightvnc, but from what I read [1] (old info, maybe obsolete), you have to setup a framebuffer in xrandr to use x11vnc on headless systems. Some other vnc clients/servers seem to do that automatically.
x11vnc is here to test what's going on. You can just plug in monitor instead.
Steps to reproduce: 1. disconnect monitor 2. start X 3. start wine done.
I've checked your link an tried commands from there. x11vnc still works, wine still not showing windows. Probably old x11vnc refused to start without some magic, but nowadays all is ok.
P.S. I'm still making regression tests. This will take some days.