[Nouveau] trouble connecting to Panduit VGA adapter

[Marko Schuetz-Schmuck]

I want to connect to an InFocus projector that sits behind a Panduit VGA
adapter. I use a Thinkpad P51 with a mini display-port to VGA
converter. The laptop runs Manjaro and has the
video-hybrid-intel-nouveau-prime installed and it works with other
monitors. For some reason it does not detect the projector that is
connected through the Panduit. The keyboard shortcut to switch monitor
configuration says "No External Display". xrandr reports only the
built-in screen. 

I talked to the technician for the room installation and he told me that
he had seen this before on a Ubuntu machine and that switching to the
proprietary nvidia driver solved that problem. For various reasons I'd
rather not switch to that driver.

I also found some lines with "DRM: DDC responded, but no EDID for DP-1"
in them from around the time I tried connecting to the projector. Could
they be related?

Is there some setting or configuration that can help in this case?

Best regards,

Marko
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