I (finally!) managed to get two ThinkVision L192p Flat Panel Monitors running on the Pi 4B with Patchbox, but only after performing (yet) another surgery on the thick acrylic Pisound box to allow the mini-HDMI cables to make proper contact. Bonus: more airflow.
The problem I have now is that Patchbox’s default-display-manager lacks GUI dual monitor management, as in Ubuntu and Raspbian, so the main screen is mirrored to the second. How can this be changed to having the secondary screen as an extended display (i.e. Not a mirror of the primary)?
Best I’ve seen so far is How to Set Up Multiple Monitors in Linux, but… Gak! Is there a simpler way of adding GUI monitor management to handle this more gracefully? Ideally, any prospect of updating PatchboxOS to include dual-monitor use?