Bug#956559: gdm3: Login screen buttons aren't clickable

[Helen Koike]

Package: gdm3
Version: 3.34.1-3
Severity: important

Dear Maintainer,

In my gdm3 screen:

https://people.collabora.com/~koike/gdm3-screen.jpeg

Clicking on buttons on top won't do anything, and when selecting a
user, clicking in the gear button to select a Desktop Environment also
doesn't do anything (which is particularly annoying since I would like to
switch between Gnome, Gnome on Xorg, Xfce and others).

Also, when I press enter on top of an user to add my password, the "Not listed?"
appears in front as shown here https://people.collabora.com/~koike/gdm3-screen-not-listed.jpeg

I can type my password and login normally, but it would be nice to easily switch
desktop environment.

I tried switching from Wayland to Xorg by editing /etc/gdm3/daemon.conf with
    WaylandEnable=false
But I get the same results.

The command:
    sudo journalctl -b -g gdm 
doesn't seem to show anything relevant http://ix.io/2hMK

Please let me know where I can find relevant logs, or how I can get more information
to help debug this.

Thanks a lot for your work as a maintainer.

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

Kernel: Linux 5.5.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.55-1
ii  adduser                               3.118
ii  dconf-cli                             0.36.0-1
ii  dconf-gsettings-backend               0.36.0-1
ii  debconf [debconf-2.0]                 1.5.73
ii  gir1.2-gdm-1.0                        3.34.1-3
ii  gnome-session [x-session-manager]     3.36.0-2
ii  gnome-session-bin                     3.36.0-2
ii  gnome-settings-daemon                 3.36.0-1
ii  gnome-shell                           3.36.1-5
ii  gnome-terminal [x-terminal-emulator]  3.36.1.1-2
ii  gsettings-desktop-schemas             3.36.0-1
ii  libaccountsservice0                   0.6.55-1
ii  libaudit1                             1:2.8.5-3
ii  libc6                                 2.30-4
ii  libcanberra-gtk3-0                    0.30-7
ii  libcanberra0                          0.30-7
ii  libgdk-pixbuf2.0-0                    2.40.0+dfsg-4
ii  libgdm1                               3.34.1-3
ii  libglib2.0-0                          2.64.1-1
ii  libglib2.0-bin                        2.64.1-1
ii  libgtk-3-0                            3.24.18-1
ii  libkeyutils1                          1.6.1-2
ii  libpam-modules                        1.3.1-5
ii  libpam-runtime                        1.3.1-5
ii  libpam-systemd                        245.4-3
ii  libpam0g                              1.3.1-5
ii  librsvg2-common                       2.48.2-1
ii  libselinux1                           3.0-1+b2
ii  libsystemd0                           245.4-3
ii  libwrap0                              7.6.q-30
ii  libx11-6                              2:1.6.9-2
ii  libxau6                               1:1.0.8-1+b2
ii  libxcb1                               1.14-2
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              11.1.0
ii  mutter [x-window-manager]             3.36.1-4
ii  policykit-1                           0.105-26
ii  procps                                2:3.3.16-4
ii  terminator [x-terminal-emulator]      1.91-4
ii  ucf                                   3.0038+nmu1
ii  x11-common                            1:7.7+20
ii  x11-xserver-utils                     7.7+8
ii  xfce4-session [x-session-manager]     4.14.1-1
ii  xfwm4 [x-window-manager]              4.14.0-2

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.36.0-2
ii  desktop-base    10.0.3
ii  x11-xkb-utils   7.7+5
ii  xserver-xephyr  2:1.20.8-2
ii  xserver-xorg    1:7.7+20
ii  zenity          3.32.0-5

Versions of packages gdm3 suggests:
ii  gnome-orca            3.36.1-1
pn  libpam-fprintd        <none>
ii  libpam-gnome-keyring  3.36.0-1

-- Configuration Files:
/etc/gdm3/daemon.conf changed:
[daemon]
WaylandEnable=false
[security]
[xdmcp]
[chooser]
[debug]


-- debconf information:
  gdm3/daemon_name: /usr/sbin/gdm3
* shared/default-x-display-manager: gdm3