Bug#776356: gdm3 shows only black screen with cursor on tripple head

[Olliver Schinagl]

Package: gdm3
Version: 3.14.1-3
Severity: normal

Dear Maintainer,

When booting with 3 monitors, internal laptopscreen, 2 external monitors, GDM
refuses to bring up the login screen, instead it shows 3 black screens with a
cursor. The cursor can happily move between all 3 screens. Booting with only 2
screens, laptop + external monitor, works fine. After logging in, I can happily
plug in the third monitor and have a tripple-head desktop.

Last time I checked on Ubuntu, a few months ago, this all worked normally, so
it has worked at 'some' point in the past.

This on a mid 2013 macbook pro retina,
00:02.0 VGA compatible controller: Intel Corporation Device 0a2e (rev 09)
[    2.598451] fbcon: inteldrmfb (fb0) is primary device
[    3.996610] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
model name: Intel(R) Core(TM) i5-4258U CPU @ 2.40GHz



-- System Information:
Debian Release: 8.0
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386, armhf

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.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]                 1.5.55
ii  gir1.2-gdm3                           3.14.1-3
ii  gnome-session [x-session-manager]     3.14.0-2
ii  gnome-session-bin                     3.14.0-2
ii  gnome-settings-daemon                 3.14.2-2
ii  gnome-shell                           3.14.2-3+b1
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                                 2.19-13
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                               3.14.1-3
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                        215-8
ii  libpam0g                              1.1.8-3.1
ii  librsvg2-common                       2.40.5-1
ii  libselinux1                           2.3-2
ii  libsystemd0                           215-8
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+b1
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]             3.14.2-1
ii  policykit-1                           0.105-8
ii  terminology [x-terminal-emulator]     0.7.0-1
ii  ucf                                   3.0030
ii  x11-common                            1:7.7+7
ii  x11-xserver-utils                     7.7+3+b1
ii  xterm [x-terminal-emulator]           312-1

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             2:1.16.2.901-1
ii  xserver-xorg               1:7.7+7
ii  zenity                     3.14.0-1

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

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