We need to get the word out that Displaylink are as bad as Nvidia. They only pretend to be linux friendly. Its fake. They actively try to prevent developers from figuring out how their devices work.
Look how many years we have been without drivers and see what the Displaylink hackers (who are really responsible for creating the linux drivers available today, that still don't support most devices properly) have to say.
http://displaylinklinuxdriver.wordpress.com
Displaylink have never created a linux driver of their own accord. They released a piece of junk calling it 'open source' that still contains closed source blobs. They even still tried to encrypt it. When hackers had already figured all that stuff out. Displaylink did not help with any of the challenges that still remain.
Displaylink's approach won't change until the situation changes.
The community needs to actively get involved and tell people about Displaylink's real nature. And boycott their products until they open up their specifications to allow linux support.