Bug#760401: gdm3: GNOME doesn't start without monitor connected after latest Debian testing update

[Andrey VI]

Package: gdm3
Version: 3.12.2-3
Severity: important

Dear Maintainer,

after latest (one week ago) big Debian testing update GNOME doesn't start anymore on headless machine, showing screen with "Oh no! Something has gone wrong. A problem has occurred and the system can't recover. Please log out and 
try again." message.
I'm using VNC to connect to the machine.
If I connect monitor GNOME starts normally. But this system works OK without monitor connected at least 2 years until last week with all regular updates installed.
Let me know what other information is needed.


-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (990, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.14-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages gdm3 depends on:
ii  accountsservice                              0.6.37-3
ii  adduser                                      3.113+nmu3
ii  dconf-cli                                    0.20.0-2
ii  dconf-gsettings-backend                      0.20.0-2
ii  debconf [debconf-2.0]                        1.5.53
ii  gir1.2-gdm3                                  3.12.2-3
ii  gnome-session [x-session-manager]            3.12.1-3
ii  gnome-session-bin                            3.12.1-3
ii  gnome-session-flashback [x-session-manager]  3.8.1-1
ii  gnome-settings-daemon                        3.12.2-1+b1
ii  gnome-shell                                  3.12.2-3
ii  gnome-terminal [x-terminal-emulator]         3.12.3-2
ii  gsettings-desktop-schemas                    3.12.2-1
ii  libaccountsservice0                          0.6.37-3
ii  libatk1.0-0                                  2.12.0-1
ii  libaudit1                                    1:2.3.7-1
ii  libc6                                        2.19-10
ii  libcairo-gobject2                            1.12.16-3
ii  libcairo2                                    1.12.16-3
ii  libcanberra-gtk3-0                           0.30-2
ii  libcanberra0                                 0.30-2
ii  libgdk-pixbuf2.0-0                           2.30.7-1
ii  libgdm1                                      3.12.2-3
ii  libglib2.0-0                                 2.40.0-5
ii  libglib2.0-bin                               2.40.0-5
ii  libgtk-3-0                                   3.12.2-3+b1
ii  libpam-modules                               1.1.8-3.1
ii  libpam-runtime                               1.1.8-3.1
ii  libpam-systemd                               208-8
ii  libpam0g                                     1.1.8-3.1
ii  libpango-1.0-0                               1.36.6-1
ii  libpangocairo-1.0-0                          1.36.6-1
ii  librsvg2-common                              2.40.3-1
ii  libselinux1                                  2.3-1
ii  libsystemd-daemon0                           208-8
ii  libsystemd-id128-0                           208-8
ii  libsystemd-journal0                          208-8
ii  libsystemd-login0                            208-8
ii  libwrap0                                     7.6.q-25
ii  libx11-6                                     2:1.6.2-3
ii  libxau6                                      1:1.0.8-1
ii  libxdmcp6                                    1:1.1.1-1
ii  libxrandr2                                   2:1.4.2-1
ii  lsb-base                                     4.1+Debian13
ii  metacity [x-window-manager]                  1:3.12.0-2
ii  policykit-1                                  0.105-6.1
ii  ucf                                          3.0030
ii  x11-common                                   1:7.7+7
ii  x11-xserver-utils                            7.7+3
ii  xterm [x-terminal-emulator]                  308-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.12.0-2
ii  desktop-base               7.0.3
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             2:1.16.0-1
ii  xserver-xorg               1:7.7+7
ii  zenity                     3.12.1-1.1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.12.2-1
ii  libpam-gnome-keyring  3.12.2-1

-- Configuration Files:
/etc/gdm3/daemon.conf changed:
[daemon]
AutomaticLoginEnable = true
AutomaticLogin = andrey
[security]
[xdmcp]
[greeter]
[chooser]
[debug]
Enable = true


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