No screen without monitor plugged in (VNC, TeamViewer)

[WeeHughie]

@wolfi323

There is only one DISPLAYMANAGER in use.

Also, if you use krfb, the display manager is actually irrelevant.
krfb just shares the current session via VNC (without going through the displaymanager).

Have you tried to disable desktop effects/compositing on the server?
Direct (hardware accelerated) OpenGL rendering obviously will not work via VNC and may cause problems if in use… And this really sounds like an OpenGL/desktop effects issue.

Alternatively, as you switched to KDM, you could just as well try to use VNC via the display manager, i.e. turn on “Remote Administration” in YaST and connect to port 5901. You should get a login screen on the client then where you can login to a remote session (note that the same user should not be logged in on the server locally, otherwise Plasma will fail to start as it cannot run twice for the same user at the same time).

Thanks for the reply, Wolfi.

I don’t recall everything now, but I ended up getting X11VNC working fine. Just loaded it up and there were absolutely no issues logging in from a client, whereas no matter what I tried, Krfb just did not work.

For me, the problem is solved - using x11vnc. I’ve got the functionality I need and wanted.

[wolfi323]

@WeeHughie

For me, the problem is solved - using x11vnc. I’ve got the functionality I need and wanted.

Great!

For x11vnc, the displaymanager should not matter either, as it also just shares the running session via VNC.

No idea why krfb didn’t work for you, I don’t know what it exactly does internally.
At least it did work fine here when I last tried…

In general, there are problems (with OpenGL) if one of the systems involved uses a proprietary driver (nvidia in particular, which doesn’t support indirect rendering at all any more AFAIK).
x11vnc doesn’t seem to be affected by this, but maybe krfb is.