Bug#784119: gdm3: Sometimes doesn't show anything but the background after logging out of a gnome session

[Mike Hommey]

Package: gdm3
Version: 3.14.1-7
Severity: normal

Dear Maintainer,

Logging out of a GNOME session came back to an empty gdm screen, only
showing the background. When clicking on the right spot, though, I could
see menus appear, but nothing could make the top bar and the login
screen appear.

In case it matters, my setup is a laptop with 2 screens connected, lid
closed, so only the 2 external monitors are displaying something.
Considering the menu shows up when clicking on the top right corner of
one of those monitors, gdm considers it as primary, exactly as when it
does display the login screen properly.

I'm not entirely sure if it only happened after logging out of a GNOME
on Wayland session or a normal GNOME session (I've been trying both
recently).


-- System Information:
Debian Release: stretch/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.0.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=ja_JP.utf8, LC_CTYPE=ja_JP.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                              0.6.37-3+b1
ii  adduser                                      3.113+nmu3
ii  dconf-cli                                    0.22.0-1
ii  dconf-gsettings-backend                      0.22.0-1
ii  debconf [debconf-2.0]                        1.5.56
ii  gir1.2-gdm3                                  3.14.1-7
ii  gnome-session [x-session-manager]            3.14.0-3
ii  gnome-session-bin                            3.14.0-3
ii  gnome-session-flashback [x-session-manager]  3.8.1-7
ii  gnome-settings-daemon                        3.14.2-3
ii  gnome-shell                                  3.14.4-1
ii  gnome-terminal [x-terminal-emulator]         3.14.1-1
ii  gsettings-desktop-schemas                    3.14.1-1
ii  libaccountsservice0                          0.6.37-3+b1
ii  libaudit1                                    1:2.4-1+b1
ii  libc6                                        2.19-18
ii  libcanberra-gtk3-0                           0.30-2.1
ii  libcanberra0                                 0.30-2.1
ii  libgdk-pixbuf2.0-0                           2.31.1-2+b1
ii  libgdm1                                      3.14.1-7
ii  libglib2.0-0                                 2.42.1-1
ii  libglib2.0-bin                               2.42.1-1
ii  libgtk-3-0                                   3.14.5-1
ii  libpam-modules                               1.1.8-3.1
ii  libpam-runtime                               1.1.8-3.1
ii  libpam-systemd                               215-17
ii  libpam0g                                     1.1.8-3.1
ii  librsvg2-common                              2.40.5-1
ii  libselinux1                                  2.3-2
ii  libsystemd0                                  215-17
ii  libwrap0                                     7.6.q-25
ii  libx11-6                                     2:1.6.3-1
ii  libxau6                                      1:1.0.8-1
ii  libxdmcp6                                    1:1.1.2-1
ii  libxrandr2                                   2:1.4.2-1+b1
ii  lsb-base                                     4.1+Debian13+nmu1
ii  metacity [x-window-manager]                  1:3.14.3-1
ii  mutter [x-window-manager]                    3.14.4-2
ii  policykit-1                                  0.105-8
ii  roxterm-gtk3 [x-terminal-emulator]           2.9.5-1
ii  ucf                                          3.0030
ii  x11-common                                   1:7.7+7
ii  x11-xserver-utils                            7.7+3+b1
ii  xterm [x-terminal-emulator]                  318-2

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.14.0-1
ii  desktop-base               8.0.2
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  x11-xkb-utils              7.7+1
ii  xserver-xephyr             2:1.16.4-1
ii  xserver-xorg               1:7.7+7
ii  zenity                     3.14.0-1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.16.1-2
ii  libpam-gnome-keyring  3.14.0-1+b1

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