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Strange viewport layout when connected to x11vnc with Remmina

cn flag

I set up a clean qemu/kvm virtual machine with Ubuntu Desktop 20.04 and trying to connect to it using Remmina (client) / x11vnc (server). But I noticed a strange behavior. It looks like the actual image is merged with a big black area on its bottom (take a look at the vertical scroll bar). This area is much bigger than the actual image as you can see from the screenshot. screenshot

Haven't noticed such behavior with other hosts. Checked all the Remmina configuration but nothing useful was found. Any ideas about what's going on?

upd. When I switch to "Scaled Mode" it looks like this. At first, I thought it is a second workspace, but no. Have no idea what is the second image at the bottom. screenshot 2

upd2. The service is started as following (from service):

ExecStart=/usr/bin/x11vnc -auth guess -forever -display :0 -loop -noxdamage -repeat -rfbauth /etc/x11vnc.pass -shared -ncache
ihorc avatar
cn flag
Solved. The root if the issue was `-ncache` attribute which is responsible for the client-side pixel caching feature.The scheme stores pixel data offscreen on the VNC viewer side for faster retrieval. https://linux.die.net/man/1/x11vnc
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