Marko Schuetz-Schmuck
2017-Sep-01 16:50 UTC
[Nouveau] trouble connecting to Panduit VGA adapter
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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 194 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20170901/9e9664e7/attachment.sig>
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 > > _______________________________________________ > Nouveau mailing list > Nouveau at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/nouveau >
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 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 >> >> _______________________________________________ >> Nouveau mailing list >> Nouveau at lists.freedesktop.org >> https://lists.freedesktop.org/mailman/listinfo/nouveau >> > _______________________________________________ > Nouveau mailing list > Nouveau at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/nouveau-------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20170901/abd4a852/attachment.html>
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 at web.de> wrote:> I'm running 4.9.43-1-MANJARO > > Ilia Mirkin <imirkin at 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 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 >>> >>> _______________________________________________ >>> Nouveau mailing list >>> Nouveau at 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
Marko Schuetz-Schmuck
2017-Sep-12 14:47 UTC
[Nouveau] trouble connecting to Panduit VGA adapter
Ilia Mirkin <imirkin at alum.mit.edu> 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 at web.de> wrote: >> I'm running 4.9.43-1-MANJARO >> >> Ilia Mirkin <imirkin at 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 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 >>>> >>>> _______________________________________________ >>>> Nouveau mailing list >>>> Nouveau at 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-- Prof. Dr. Marko Schütz-Schmuck Department of Mathematical Sciences University of Puerto Rico at Mayagüez Mayagüez, PR 00681 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 194 bytes Desc: not available URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20170912/86a9707a/attachment.sig>