Hello, I used vnc on windows and a tablet with vnc viewer. The raspberry pi 4 was connected with a HDMI monitor. It worked very well, I didn’t have a problem. But later, I realized when i turn on the raspberry pi without HDMI monitor, only using vnc. My desktop didn’t have a wallpaper, it had a black screen and there was a kind of echo with the icons and applications (as the image). It was working slowly I had to wait some time for reboot the rasp pi.
I installed vnc with Budgie arm Tweak Tool, and use the KMS video mode. With legacy or FKMS raise an error on vnc viewer.
I hope that someone knows about this error. Help me please 
