@Corbeau I’m also trying to get the UD-3900H working. Can you share or describe any modifications you made to the displayport script?
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I’m on the road currently. When I return, i will pull it from backups and share it.
FYI. The device listed in this thread has open source drivers which are now in the mainline kernel. They state that they are working with kernel devs on the site: https://plugable.com/products/usb-vga-165/
Can anyone give an update of how well your setup is working in 2020 and with what distros/releases?
About your HP 3005PR, it seems the issues are related with DisplayPort. How about HDMI, does that work out of the box? And does it work under Wayland?