Perhaps udl is not needed?
If I use
sudo modprobe -r udl
my application still runs and can maintain output to the Xenarc after one second ("Displaylink CD" not present and no Mint hotplug sounds).
Does this mean that udl is not required when accessing a Displaylink device through libdlo? If so, then perhaps I should focus on making "Displaylink CD" disappear from the devices list of the "Disks" utility?
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