I have Surface Pro and https://plugable.com/products/uga-4khdmi
Issu is : impossible to choose resolution for the screen its bloqued to 640x480 
Hi Jean-Christophe BR,
Thanks for contacting us, I am sorry this is not working as expected.
Based on your description of the behavior, our first step is to get some additional information from your system.
If you would, please keep the adapter connected and monitor attached (even though it is not working) and send us the output of our diagnostic utility PlugDebug ( http://plugable.com/support/plugdebug ) as this will allow us to examine some log files from your system to help determine the next steps.
To protect your privacy, please email the log files to support@plugable.com and please reference Ticket #211455 in the subject line.
Thanks,
Pat
Plugable Technologies
www.plugable.com/support
Hello Jean-Christophe BR,
We’re closing this thread due to inactivity, but if you have any further questions please feel free to contact support@plugable.com and we’ll be happy to help.
Thanks,
Pat
Plugable Technologies
www.plugable.com/support