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Bug 1919001

Summary:	Random monitor freezing observed when utilizing docking station and Nouveau drivers.
Product:	Red Hat Enterprise Linux 8	Reporter:	Brandon Clark <brclark>
Component:	mutter	Assignee:	Jonas Ådahl <jadahl>
Status:	CLOSED INSUFFICIENT_DATA	QA Contact:	Desktop QE <desktop-qa-list>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	8.3	CC:	alanm, amike, ayadav, brclark, casantos, fmuellner, jwright, kherbst, mbliss, mkolbas, sbarcomb, tpopela
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-30 12:31:55 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Brandon Clark 2021-01-21 21:26:11 UTC

Description of problem:
When utilizing a WD19TB docking station alongside the Nouveau graphical drivers, monitor freezing is observed on a random basis.

Version-Release number of selected component (if applicable):
mutter-3.32.2-48.el8.x86_64
xorg-x11-drv-nouveau-1.0.15-4.el8.1.x86_64

How reproducible:
Customer observed this occurring randomly on system with Quadro T1000 Mobile. I was not able to reproduce on system with Quadro FX 380.

Steps to Reproduce:
1. Plug in dock.
2. Add monitors.
3. Observe behavior.

Actual results:
Random monitor freezing.

Expected results:
No freezing occurring on the monitors.

Additional info:
Unable to reproduce issue properly with available hardware. Was suggested to open bug listing.

Comment 1 Jonas Ådahl 2021-01-22 21:54:28 UTC

If it freezes out of the blue, it's likely a kernel issue. Could you run the following command as root:

    echo 0xfe > /sys/module/drm/parameters/debug

then wait for the issue to happen. Take a note of the time, e.g. 15:33:12, and attach the output from the journal up until around that time stamp, e.g. if the issue happened at 15:33:12, run

    journalctl -m --until=22:34 --since=22:20 > journal.log

then attach the resulting journal.log file.

To disable kernel debug logging, become root again and run

    echo 0 > /sys/module/drm/parameters/debug