Bug 94948 - [NV117] Second external monitor not recognized
Summary: [NV117] Second external monitor not recognized
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/nouveau (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Nouveau Project
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-04-15 11:41 UTC by Carsten Pfeiffer
Modified: 2017-10-06 06:15 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments
the full kernel log (66.90 KB, text/plain)
2016-04-15 11:41 UTC, Carsten Pfeiffer 		no flags Details
Xorg log (55.28 KB, text/plain)
2016-04-15 12:08 UTC, Carsten Pfeiffer 		no flags Details
Video Bios (104.00 KB, application/octet-stream)
2016-04-15 12:59 UTC, Carsten Pfeiffer 		no flags Details
View All

Description Carsten Pfeiffer 2016-04-15 11:41:02 UTC 
Created attachment 122966 [details]
the full kernel log

I have a Lenovo P50 notebook with a docking station and two externally attached monitors, but I won't get more than one external "connected" display (+ the internal LCD). I tried to connect via DVI, DisplayPort and HDMI in all combinations, but xrandr only shows
eDP-1 connected
DP-1 connected
DP-2 disconnected
DP-3 disconnected

Sometimes I manage to get both external monitors to display the same contents, but I have never managed to use one as primary and the other as secondary display.

01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M2000M] (rev a2) (prog-if 00 [VGA controller])
01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1)

Linux nb 4.4.0-1-amd64 #1 SMP Debian 4.4.6-1 (2016-03-17) x86_64 GNU/Linux
xserver-xorg                   1:7.7+14
xserver-xorg-core              2:1.18.3-1
xserver-xorg-video-nouveau     1:1.0.12-1+b1
libdrm2:amd64                  2.4.67-1
libdrm-nouveau2:amd64          2.4.67-1

libegl1-mesa:amd64           11.1.2-1
libgl1-mesa-dri:amd64        11.1.2-1
libgl1-mesa-glx:amd64        11.1.2-1
libglapi-mesa:amd64          11.1.2-1
libgles1-mesa:amd64          11.1.2-1
libgles2-mesa:amd64          11.1.2-1
libglu1-mesa:amd64           9.0.0-2.1
libwayland-egl1-mesa:amd64   11.1.2-1
mesa-utils                   8.3.0-1
mesa-vdpau-drivers:amd64     11.1.2-1

Bios is the most recent one from 2016-04-1 (1.21).
Comment 1 Carsten Pfeiffer 2016-04-15 12:08:31 UTC 
Created attachment 122967 [details]
Xorg log
Comment 2 Carsten Pfeiffer 2016-04-15 12:59:24 UTC 
Created attachment 122968 [details]
Video Bios
Comment 3 Ilia Mirkin 2016-04-15 16:16:40 UTC 
Looks like you only have DP outputs. Chances are the dock all plugs into DP-1 with a DP-MST hub with passive (or even active) adapters for DVI and HDMI. Unfortunately nouveau does not at present support MST.

If you use the proprietary driver, I think those outputs will come out as DP-1.1, DP-1.2, etc.
Comment 4 Carsten Pfeiffer 2016-04-20 09:14:41 UTC 
Thank you for your hints, Ilia. This made try one more thing I hadn't checked before: use one output on the dock and another directly on the notebook. And this does work, so I get eDP-1, DP-1 and DP-2 now.

Out of curiosity, do you know if MST is considered or planned for nouveau?
Comment 5 Carsten Pfeiffer 2017-10-06 06:15:59 UTC 
This works for me now! :happy:

Linux 4.13.0-1-amd64
libdrm-nouveau2 2.4.83-1
xserver-xorg 1:7.7+19
xserver-xorg-core 2:1.19.3-2
xserver-xorg-video-nouveau 1:1.0.15-2

Thanks a bunch!

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