Bug#894306: gnome-control-center: gnome display external monitor resolution higher than full hd freezes the system: only in 3.28

[toddjsnider at gmail.com]

A similar issue arose for me after a recent update.  The display
freezes whenever I plug in my 4K external display.  It happens in both
gdm and Gnome, but not in X11, so my workaround for now is to
disconnect the display in gdm and login to X11 before reconnecting the
display.

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.15.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.$
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-shell depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.1-3
ii  evolution-data-server                        3.26.5-2
ii  gir1.2-accountsservice-1.0                   0.6.45-1
ii  gir1.2-atspi-2.0                             2.28.0-1
ii  gir1.2-freedesktop                           1.56.0-2
ii  gir1.2-gcr-3                                 3.28.0-1
ii  gir1.2-gdesktopenums-3.0                     3.28.0-1
ii  gir1.2-gdm-1.0                               3.28.0-1
ii  gir1.2-geoclue-2.0                           2.4.7-1
ii  gir1.2-glib-2.0                              1.56.0-2
ii  gir1.2-gnomebluetooth-1.0                    3.28.0-2
ii  gir1.2-gnomedesktop-3.0                      3.28.0-1
ii  gir1.2-gtk-3.0                               3.22.29-2
ii  gir1.2-gweather-3.0                          3.28.1-1
ii  gir1.2-ibus-1.0                              1.5.17-3
ii  gir1.2-mutter-2                              3.28.0-2
ii  gir1.2-nm-1.0                                1.10.6-2
ii  gir1.2-nma-1.0                               1.8.10-2
ii  gir1.2-pango-1.0                             1.40.14-1
ii  gir1.2-polkit-1.0                            0.105-18
ii  gir1.2-rsvg-2.0                              2.40.20-2
ii  gir1.2-soup-2.4                              2.62.0-1
ii  gir1.2-upowerglib-1.0                        0.99.7-2
ii  gjs                                          1.52.0-2
ii  gnome-backgrounds                            3.28.0-1
ii  gnome-settings-daemon                        3.28.0-1
ii  gnome-shell-common                           3.28.0-1
ii  gsettings-desktop-schemas                    3.28.0-1
ii  libatk-bridge2.0-0                           2.26.2-1
ii  libatk1.0-0                                  2.28.1-1
ii  libc6                                        2.27-2
ii  libcairo2                                    1.15.10-1
ii  libcanberra-gtk3-0                           0.30-6
ii  libcanberra0                                 0.30-6
ii  libcroco3                                    0.6.12-2
ii  libecal-1.2-19                               3.26.5-2
ii  libedataserver-1.2-22                        3.26.5-2
ii  libgcr-base-3-1                              3.28.0-1
ii  libgdk-pixbuf2.0-0                           2.36.11-2
ii  libgirepository-1.0-1                        1.56.0-2
ii  libgjs0g [libgjs0-libmozjs-52-0]             1.52.0-2
ii  libglib2.0-0                                 2.56.0-4
ii  libglib2.0-bin                               2.56.0-4
ii  libgstreamer1.0-0                            1.14.0-1
ii  libgtk-3-0                                   3.22.29-2
ii  libical3                                     3.0.1-5
ii  libjson-glib-1.0-0                           1.4.2-3
ii  libmutter-2-0                                3.28.0-2
ii  libnm0                                       1.10.6-2
ii  libpango-1.0-0                               1.40.14-1
ii  libpangocairo-1.0-0                          1.40.14-1
ii  libpolkit-agent-1-0                          0.105-18
ii  libpolkit-gobject-1-0                        0.105-18
ii  libpulse-mainloop-glib0                      11.1-4
ii  libpulse0                                    11.1-4
ii  libsecret-1-0                                0.18.5-6
ii  libstartup-notification0                     0.12-5
ii  libsystemd0                                  238-3
ii  libx11-6                                     2:1.6.5-1
ii  libxfixes3                                   1:5.0.3-1
ii  mutter                                       3.28.0-2
ii  python3                                      3.6.4-1

Versions of packages gnome-shell recommends:
ii  chrome-gnome-shell    9-1
ii  gdm3                  3.28.0-1
ii  gkbd-capplet          3.26.0-3
ii  gnome-control-center  1:3.28.0-1
ii  gnome-user-docs       3.28.0-1
ii  iio-sensor-proxy      2.4-2
ii  switcheroo-control    1.2-1
ii  unzip                 6.0-21

Versions of packages gnome-shell suggests:
ii  gir1.2-telepathyglib-0.12   0.24.1-2
ii  gir1.2-telepathylogger-0.2  0.8.2-3

-- no debconf information