The same problem with my Dell.
The patch helped for couple months, but it stopped working recently for some reason. I updated everything in Ubuntu and applied the patch again - external monitors do not turn on at all. DisplayLink device is visible, network is working via it, but not the displays.
I can share specs, versions if that helps, just please tell what you need to know.
But it doesn't look like DisplayLink is keen on solving this problem.
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