While I already sent logs to email address, I played around a bit with configurations and found out that in my case only “WaylandModes compositor” works. It does not matter if EGLCapture is turned on or off, basically every other combination will give gray screen on both on GDM and Gnome Desktop. It confuses me, since every other thread or KB suggest enabling EGLCapture and setting WaylandModes to egl or drm. I guess it is typical “it works on my machine” problem, but in my case it is opposite—”it does not work on my machine”.