Bug#863271: gdm3: blank screen on redume

[Fede]

Package: gdm3
Version: 3.22.3-2
Severity: important

Dear Maintainer,

I'm using a laptop (Dell XPS 15 9550) connected to a docking station (Dell
WD15).  The docking station is connected to a Monitor with multiple inputs
through a DisplayPort cable.  I also have a second computer connected to the
same monitor on a different DisplayPort input.  When I suspend the laptop and
the other computer is running, the monitor automatically switches input to the
one of the running computer.  When I later resume the laptop and switch the
monitor input port to the one connected to the laptop all I can see is a blank
screen.  Opening the laptop lid and trying to use the internal display doesn't
work either.  The only thing that I can do is reboot the machine the hard way,
through the power button.

I would expect the session being able to rediscover the external monitor or at
least switch to the internal display.

Regards,
Fede



-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64
 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.43-1
ii  adduser                               3.115
ii  dconf-cli                             0.26.0-2+b1
ii  dconf-gsettings-backend               0.26.0-2+b1
ii  debconf [debconf-2.0]                 1.5.60
ii  gir1.2-gdm-1.0                        3.22.3-2
ii  gnome-session [x-session-manager]     3.22.3-1
ii  gnome-session-bin                     3.22.3-1
ii  gnome-settings-daemon                 3.22.2-2
ii  gnome-shell                           3.22.3-3
ii  gnome-terminal [x-terminal-emulator]  3.22.2-1
ii  gsettings-desktop-schemas             3.22.0-1
ii  libaccountsservice0                   0.6.43-1
ii  libaudit1                             1:2.6.7-2
ii  libc6                                 2.24-10
ii  libcanberra-gtk3-0                    0.30-3
ii  libcanberra0                          0.30-3
ii  libgdk-pixbuf2.0-0                    2.36.5-2
ii  libgdm1                               3.22.3-2
ii  libglib2.0-0                          2.50.3-2
ii  libglib2.0-bin                        2.50.3-2
ii  libgtk-3-0                            3.22.11-1
ii  libkeyutils1                          1.5.9-9
ii  libpam-modules                        1.1.8-3.5
ii  libpam-runtime                        1.1.8-3.5
ii  libpam-systemd                        232-23
ii  libpam0g                              1.1.8-3.5
ii  librsvg2-common                       2.40.16-1+b1
ii  libselinux1                           2.6-3+b1
ii  libsystemd0                           232-23
ii  libwrap0                              7.6.q-26
ii  libx11-6                              2:1.6.4-3
ii  libxau6                               1:1.0.8-1
ii  libxcb1                               1.12-1
ii  libxdmcp6                             1:1.1.2-3
ii  lsb-base                              9.20161125
ii  mutter [x-window-manager]             3.22.3-2
ii  policykit-1                           0.105-17
ii  ucf                                   3.0036
ii  x11-common                            1:7.7+19
ii  x11-xserver-utils                     7.7+7+b1
ii  xterm [x-terminal-emulator]           327-2

Versions of packages gdm3 recommends:
ii  at-spi2-core    2.22.0-6
ii  desktop-base    9.0.2
ii  x11-xkb-utils   7.7+3+b1
ii  xserver-xephyr  2:1.19.2-1
ii  xserver-xorg    1:7.7+19
ii  zenity          3.22.0-1+b1

Versions of packages gdm3 suggests:
ii  gnome-orca            3.22.2-3
ii  libpam-gnome-keyring  3.20.0-3

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