Originally posted by deadite66
1. Make sure you use the udl (DRM/KMS) driver, not udlfb
2. Make sure the dri node is accessible, i.e. it is listed by "loginctl seat-status seat0"
If everything is set up correctly (which is the default on any sane current distribution), the output should show up with:
xrandr --listproviders
Two providers should be listed.
Currently there is no graphical xrandr frontend supporting output providers, AFAIK
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