Also have this problem, Ubuntu 20.04 on a Lenovo laptop, AMD Raedon Graphics card. Installed the latest version of the driver, however when I plug in the displaylink the DisplayLinkManager process immediately starts eating up CPU. If I drag anything onto the other screen it jumps to well over 100% and starts really stuttering. Seems like a very common issue based on the number of posts I've seen, but unfortunately no resolution!
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