Missing characters in gnome-shell after lock screen

[dmiller309]

I locked my screen, came back from lunch, and found that about half the characters in the lock screen were missing. After I logged back in, half the characters in the desktop were missing (https://drive.google.com/file/d/1mIDF4_jY0PIFOT53FoOOVoTY1BWeaNfy/view?usp=sharing). Chrome and Nautilus are not missing any characters, just the system UI.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
NonfreeKernelModules: wl nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 29 12:25:58 2018
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'enabled-extensions' b"['<email address hidden>', '<email address hidden>']"
 b'org.gnome.shell' b'favorite-apps' redacted by apport
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'clock-show-seconds' b'true'
 b'org.gnome.desktop.interface' b'clock-show-date' b'true'
InstallationDate: Installed on 2018-04-10 (48 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Also tracking in https://bugzilla.gnome.org/show_bug.cgi?id=728158

[Daniel van Vugt (vanvugt)]

Also reported with Intel graphics (bug 1782458)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

The upstream bug is also Intel: https://bugzilla.gnome.org/show_bug.cgi?id=728158

I was too quick to blame Nvidia this time.

[Daniel van Vugt (vanvugt)]

See also bug 1876632.

[Daniel van Vugt (vanvugt)]

If your primary GPU is Nvidia then bug 1876632 is more likely your issue.