VNC fails when computer is set to use X11

[probonopd]

VNC fails when computer is set to use X11 in Raspberry Pi reference 2024-11-19.

Steps to reproduce:

• Enable VNC server
• Test it - it works
• Switch computer to use X11 using sudo raspi-config
• Try to access VNC server - only seeing a gray background now, rather than the desktop

[lurch]

The X11 VNC server and Wayland VNC server are actually separate programs/services, and raspi-config (currently) doesn't switch VNC services when you change GUI modes; so at the moment you have to do:

• Enable VNC server
• Test it - it works
• Disable VNC server (i.e. disable the Wayland VNC server)
• Switch computer to use X11 using sudo raspi-config
• Reboot
• Enable VNC server (i.e. enable the X11 VNC server)
• Try to access VNC server - it should work now

(and the same disable-VNC, switch GUIs, enable-VNC dance if you want to switch from X11 back to Wayland)