It looks like the latest gnome-shell fixed the issue for me:
apt policy gnome-shell
gnome-shell:
Installed: 3.34.3-1ubuntu1
Candidate: 3.34.3-1ubuntu1
Version table:
*** 3.34.3-1ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1858120
Title:
Graphical corruption Intel HD Graphics 630 when using Firefox nightly
in Wayland mode
Status in Mozilla Firefox:
Unknown
Status in firefox package in Ubuntu:
Incomplete
Status in mutter package in Ubuntu:
Incomplete
Bug description:
Also tracked in: https://bugzilla.mozilla.org/show_bug.cgi?id=1604948
Once every few starts of Firefox on my machine ends up corrupting the
display of my Wayland session badly - what looks like a lot of stray
marks on my display are seen overlaid on top of all windows, not just
Firefox.
Logging out and logging back in resolves the issue, but there is a
chance that it recurs on next launch.
Steps to reproduce:
1. Start Gnome session in Wayland mode.
2. Start Firefox Nightly with MOZ_ENABLE_WAYLAND=1
What happens:
Various issues, including "unknown" application appearing in task
switcher, stray marks on screen, and dead/inactive windows that
persist over other windows even when switching virtual desktops.
Response from Firefox bugzilla says:
This is likely a bug in GS 3.34, fixed by
https://gitlab.gnome.org/GNOME/mutter/merge_requests/924 and
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/815, included in
3.34.2 which should arrive soon in Ubuntu 19.10.
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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
CurrentDesktop: GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-01-01 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191230)
Package: gnome-shell 3.34.1+git20191024-1ubuntu1
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
RelatedPackageVersions: mutter-common 3.34.2-2ubuntu1
Tags: focal wayland-session
Uname: Linux 5.3.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
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