trouble connecting to Panduit VGA adapter

trouble connecting to Panduit VGA adapter

[Marko Schuetz-Schmuck]

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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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Re: trouble connecting to Panduit VGA adapter

[Ilia Mirkin]

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@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
>
> _______________________________________________
> Nouveau mailing list
> Nouveau@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau
>
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Re: trouble connecting to Panduit VGA adapter

[Roy Spliet]

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If this doesn't work I suspect the converter is really blocking/damaging 
the EDID information. The official NVIDIA driver is willing to fall back 
to default modes, but this fall-back was handled less gracefully on 
nouveau last time I checked.

You might be able to use the xrandr tool to manually add a mode for the 
display. Forgive me for not knowing the exact syntax, but from what I 
recall you can use cvt to generate a modeline and copy-paste the 
parameters into an xrandr command to add, then use a second xrandr 
command to enable the display either in mirror mode or positioned 
relative to another display. If you're lucky, that mode corresponds well 
enough with what the projector will accept to just work.


Op 01-09-17 om 18:01 schreef Ilia Mirkin:
> 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-S0/GAf8tV78@public.gmane.org> 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
>>
>> _______________________________________________
>> Nouveau mailing list
>> Nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
>> https://lists.freedesktop.org/mailman/listinfo/nouveau
>>
> _______________________________________________
> Nouveau mailing list
> Nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau


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Re: trouble connecting to Panduit VGA adapter

[Ilia Mirkin]

Does v4.13 fix your issues? v4.10 also included significant rework
related to DP-MST, and I wouldn't be surprised if it fixed a few DP
issues along the way. (Also, please don't drop the list from your
replies.)

On Mon, Sep 4, 2017 at 9:30 AM, Marko Schuetz-Schmuck
<MarkoSchuetz@web.de> wrote:
> I'm running 4.9.43-1-MANJARO
>
> Ilia Mirkin <imirkin@alum.mit.edu> writes:
>
>> 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@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
>>>
>>> _______________________________________________
>>> Nouveau mailing list
>>> Nouveau@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/nouveau
>>>
>
> --
> Prof. Dr. Marko Schütz-Schmuck
> Department of Mathematical Sciences
> University of Puerto Rico at Mayagüez
> Mayagüez, PR 00681
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Re: trouble connecting to Panduit VGA adapter

[Marko Schuetz-Schmuck]

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Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> writes:

> Does v4.13 fix your issues? v4.10 also included significant rework
> related to DP-MST, and I wouldn't be surprised if it fixed a few DP
> issues along the way. (Also, please don't drop the list from your
> replies.)

With v4.13 the laptop screen goes black after modprobe nouveau

> On Mon, Sep 4, 2017 at 9:30 AM, Marko Schuetz-Schmuck
> <MarkoSchuetz-S0/GAf8tV78@public.gmane.org> wrote:
>> I'm running 4.9.43-1-MANJARO
>>
>> Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> writes:
>>
>>> 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-S0/GAf8tV78@public.gmane.org> 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
>>>>
>>>> _______________________________________________
>>>> Nouveau mailing list
>>>> Nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
>>>> https://lists.freedesktop.org/mailman/listinfo/nouveau
>>>>
>>
>> --
>> Prof. Dr. Marko Schütz-Schmuck
>> Department of Mathematical Sciences
>> University of Puerto Rico at Mayagüez
>> Mayagüez, PR 00681

-- 
Prof. Dr. Marko Schütz-Schmuck
Department of Mathematical Sciences
University of Puerto Rico at Mayagüez
Mayagüez, PR 00681

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