[Nouveau] trouble connecting to Panduit VGA adapter

Ilia Mirkin imirkin at alum.mit.edu
Fri Sep 1 17:01:27 UTC 2017

Are you running a v4.12-based kernel? If so, update to v4.13-rcN or
integrate https://github.com/skeggsb/linux/commit/13a86519202c5d119d83640d6f781f3181205d2c
into your kernel build.

On Fri, Sep 1, 2017 at 12:50 PM, Marko Schuetz-Schmuck
<MarkoSchuetz at web.de> wrote:
> 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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