Login screen, black screen, login screen when using TigerVNC

[ManjaroDevOps]

@worsthorse

It looks like I have to reboot the machine to switch back and forth between the vncserver display :1 and the normal display :0 which is definitely not the behavior I expect.

Does sound like you are trying to use the same login simultanously - this is unsupported by tigervnc.

@ManjaroDevOps

TigerVNC Limitations

Multiple X sessions for a single user are not supported
– TigerVNC - ArchWiki

This effectively means - if you are logged onto the physical display :0 then you cannot connect a vnc session. If you try to do so, using the same username, a black screen or system lockup will be the likely result.

In that regard it works like Microsoft RDP which logout the physical session when you initiate a remote connection and vice-versa.

Please see the following topics for instructions

→ [root tip] [How To] TigerVNC Quick Setup
→ [root tip] [How To] TigerVNC over SSH

display:0 is the console - the root display so to speak.

You specifically state you are using xfce - which in turn comes with lightdm - which defaults to open a session at display:7 (at least that is how I remember it)