Plex no longer sees my Hauppauge WinTV-quadHD tuner, "Add Device" scans forever

Related topic: DVR setup fails
My last post in this topic summarizes the current state of scanning channels with a Hauppauge tuner.

Seems that all topics found in this forum boil down to the same conclusion.
Problem got fixed 2-3 months ago for windows.
Problem still exist for Linux servers.

Looking forward to a reply from the Plex support team.
Would be awesome if this problem gets fixed for Linux servers as well.