Bug 110993

Summary: GP107GLM [Quadro P1000 Mobile]: frequent failure to initialize displays on Thunderbolt dock
Product: xorg Reporter: Markus Wanner <markus>
Component: Driver/nouveauAssignee: Nouveau Project <nouveau>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
test run 1 - annotated kern.log
none
test run 2 - annotated kern.log none

Description Markus Wanner 2019-06-25 10:51:11 UTC 
When connecting to the Thunderbolt 3 Dock, the monitors attached to it more often remain black rather than showing a proper image.  Sometimes the Laptop freezes entirely, other times just one of the two comes up, most of the time, they remain black and eventually enter standby.

I'm using a Lenovo P1 featuring a Quadro P1000 Mobile GPU.  An integrated GPU is wired to the internal display as eDP-1.  The Nvidia card exposes an HDMI port on the laptop.  Plugging a monitor there directly usually works.  Vie the docking station, I get another 3 ports controlled by the Nvidia GPU.  These are either HDMI or DisplayPort.  I have two monitors for experimentation, a Dell one and a Lenovo one.

I'm running a Linux 5.2-rc5 kernel and the nouveau driver compiled from a current checkout of the git repo of Ben Skeggs (https://github.com/skeggsb/nouveau/tree/f91e915b6a12c281aed4401a869881f293b72d4e).  Most of the time, I'm running with the runpm_fixes of Karol Herbst (that is the last five revisions from https://github.com/karolherbst/nouveau/tree/runpm_fixes).

The output of `grep . /sys/class/drm/card*-*/status` after a start w/o the dock or any display attached is:

/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card1-DP-1/status:disconnected
/sys/class/drm/card1-DP-2/status:disconnected
/sys/class/drm/card1-HDMI-A-1/status:connected
/sys/class/drm/card1-eDP-2/status:disconnected

I'll provide further details of what I did together with the corresponding kernel logs with tracing enabled in follow-up comments and attachments.
Comment 1 Markus Wanner 2019-06-25 11:45:51 UTC 
Created attachment 144633 [details]
test run 1 - annotated kern.log

Starting condition: dock already attached, but no monitors plugged into the dock or the laptop.  Using nouveau without runpm_fixes.

The attached log is collected from /var/log/kern.log via ssh, so as to preserve most of the data even in case of a crash.  I annotated it with actions performed and observations made at the following points in time:

Jun 21 10:32:37 calaton kernel: [   71.352739]: login
Jun 21 10:33:30 calaton kernel: [  124.428250]: plug in HDMI cable into laptop directly

Observation after a couple of seconds: works, proper image shown on the Lenovo display.  The grep command yields:

/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card1-DP-1/status:disconnected
/sys/class/drm/card1-DP-2/status:disconnected
/sys/class/drm/card1-HDMI-A-1/status:connected
/sys/class/drm/card1-eDP-2/status:disconnected

Jun 21 10:34:59 calaton kernel: [  213.433544]: pull out HDMI cable - all fine
Jun 21 10:35:45 calaton kernel: [  259.672821]: plug HDMI cable into dock - not recognized, display lights up, but goes back into standby
Jun 21 10:36:57 calaton kernel: [  331.284818]: plug Dell (DP) into dock - not recognized, display lights up, but goes back into standby
Jun 21 10:37:22 calaton kernel: [  356.470787]: pull HDMI cable out of dock - no change, display lights up, but goes back into standby
Jun 21 10:38:42 calaton kernel: [  436.169622]: plug HDMI cable into laptop - recognized
Jun 21 10:39:00 calaton kernel: [  453.731368]: unplug the Dock - no change, Levovo on HDMI and internal display remain active.
Jun 21 10:40:10 calaton kernel: [  524.314909]: re-plug the Dock - Dell not recognized
Jun 21 10:41:10 calaton kernel: [  584.005627]: pull HDMI cable from the laptop
Jun 21 10:41:31 calaton kernel: [  604.833610]: plug HDMI cable into dock - neither Dell nor Lenovo recognized
Jun 21 10:42:32 calaton kernel: [  665.790854]: pull the Dock
Jun 21 10:42:47 calaton kernel: [  681.020228]: plug the Dock again
Jun 21 10:44:05 calaton kernel: [  759.618299]: crash, laptop fully unresponsive to keyboard, mouse or network inputs
Comment 2 Markus Wanner 2019-06-25 12:26:26 UTC 
Created attachment 144634 [details]
test run 2 - annotated kern.log

For the second run, I re-enabled the runpm_fixes and tried to perform the exact same steps as during run 1 to check if that makes a difference.  Same starting conditions otherwise: dock already attached, but no monitors plugged into the dock or the laptop.

Jun 21 10:49:13 calaton kernel: [  199.796511]: login
Jun 21 10:49:47 calaton kernel: [  234.186963]: plug HDMI into laptop directly, works
Jun 21 10:50:00 calaton kernel: [  246.472930]: pull HDMI cable from laptop
Jun 21 10:51:34 calaton kernel: [  341.384332]: plug HDMI cable into dock - not recognized, display lights up, but goes back into standby
Jun 21 10:52:20 calaton kernel: [  386.757948]: plug DP into dock - not recognized, display lights up, but goes back into standby
Jun 21 10:52:57 calaton kernel: [  424.339095]: pull HDMI cable out of dock - no change, display lights up, but goes back into standby
Jun 21 10:53:36 calaton kernel: [  462.525517]: plug HDMI cable into laptop - recognized
Jun 21 10:53:51 calaton kernel: [  477.800605]: unplug the Dock - no change, Levovo on HDMI and internal display remain active.
Jun 21 10:54:51 calaton kernel: [  537.523191]: re-plug the Dock - Dell not recognized
Jun 21 10:55:16 calaton kernel: [  562.760425]: pull the HDMI cable
Jun 21 10:55:57 calaton kernel: [  604.330288]: plug HDMI cable into dock - neither Dell nor Lenovo recognized
Jun 21 10:56:40 calaton kernel: [  647.138495]: pull the dock
Jun 21 10:56:55 calaton kernel: [  662.366295]: plug the Dock again
Jun 21 10:58:26 calaton kernel: [  752.986238]: pull the dock
Jun 21 10:58:41 calaton kernel: [  768.201244]: plug the Dock again
Jun 21 10:59:53 calaton kernel: [  840.353587]: pull the dock, pull the HDMI from the dock
Jun 21 11:00:08 calaton kernel: [  855.417667]: plug the dock (with only the DP display attached)
Jun 21 11:01:48 calaton kernel: [  955.154927]: pull the dock
Jun 21 11:02:03 calaton kernel: [  970.227148]: re-plug the dock (with only the HDMI display attached)
Jun 21 11:03:14 calaton kernel: [ 1040.747229]: pull the dock, pull the HDMI from the dock, re-attach DP to the dock
Jun 21 11:03:29 calaton kernel: [ 1055.830960]: attach HDMI to laptop - recognized properly

/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card1-DP-1/status:disconnected
/sys/class/drm/card1-DP-2/status:disconnected
/sys/class/drm/card1-HDMI-A-1/status:connected
/sys/class/drm/card1-eDP-2/status:disconnected

Jun 21 11:05:00 calaton kernel: [ 1146.466630]: re-plug the dock (with HDMI already attached, DP on dock)
Jun 21 11:06:28 calaton kernel: [ 1234.650085]: unplug the DP from the dock
Jun 21 11:07:00 calaton kernel: [ 1266.460845]: re-plug the DP to the dock
Jun 21 11:07:30 calaton kernel: [ 1297.127079]: unplug the dock from the laptop

Again, the attached log is annotated with actions and observations.
Comment 3 Martin Peres 2019-12-04 09:50:18 UTC 
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