A fork to debug the hotplug events.
wget https://github.com/pseudocc/udev-monitor-hotplug/releases/download/stable/udev-monitor-hotplug.deb
sudo dpkg -i udev-monitor-hotplug.deb
sudo rm -f udev-monitor-hotplug.deb
sudo journalctl -f
OR
sudo service udev stop
sudo udevd --debug 2>&1 | tee /tmp/udev.log
check what's happening when you plug/unplug your monitor
I'm not responsible of the effect of this script on your computer
Feel free to do whatever you want with it :-)