[nouveau] changing screen position, dash is gone, background is black.. and flashing white on any attempt to operate anything

[Chris Guiver]

Ubuntu 20.04 LTS daily QA-test (live) on hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

Background:

Another exploration of http://launchpad.net/bugs/1869571, primarily as I want screen dump to file bug upstream as requested; this box shares screens of hp 8200 that had it before, so I'd expect can easily re-create it.. I hadn't re-create that issue on this box though.. This box has menu on display I prefer, so maybe has cables reversed to hp 8200 used earlier in 1869571, mentioned in case related - but different issue

What I did:

Opened `displays` to adjust to match setup (vertical alignment of screens); and on hitting "apply" the system has gone strange
 - black background (both displays)
 - lots of (white) flashing on mouse movements if near panel/dash
 - dash is gone, like it has background color but icons gone, now only ~half height of monitor (it was screen height before apply with icons)

Menu items could no longer be operated as not viewable (let alone white flashes being very annoying)

I pressed printscreen to get screencapture once `ubuntu-bug` was started; and the dash was re-drawn!!? (it was not there after screen position was changed & until printscreen was hit)...

Printscreen also stopped all white-flashes, and the system is now operational again?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.0-2ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CasperVersion: 1.441
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 30 05:21:52 2020
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.desktop.input-sources' b'sources' b"[('xkb', 'us'), ('xkb', 'au'), ('xkb', 'cm'), ('xkb', 'gb')]"
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200329)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.0-2ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

What's left of the attached like 'ShellJournal.txt' is showing constant nouveau messages. Please try installing the nvidia driver and tell us if the problem goes away.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1869650

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for mutter (Ubuntu) because there has been no activity for 60 days.]