Bug#842421: gnome-screensaver: Regression? Refusing to launch on a different X display

[Robert Ou]

Package: gnome-screensaver
Version: 3.6.1-7+b1
Severity: important

Dear Maintainer,

After updating packages, I discovered that gnome-screensaver is now
refusing to launch a second copy of itself on a different X display from
an existing copy. Before, this would Just Work, but now
gnome-screensaver explicitly complains "screensaver already running in
this session."

The particular way I have my system set up requires me to use
two separate X displays (e.g. :0 and :1). Before, I was able to lock
either display by running two copies of gnome-screensaver and running
"gnome-screensaver-command -l" with the appropriate DISPLAY setting.
Now, I am only able to ever lock one of the X displays because
gnome-screensaver won't launch a second copy and
gnome-screensaver-command communicates with the first copy regardless of
DISPLAY.

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

Kernel: Linux 4.7.0-1-amd64 (SMP w/20 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 gnome-screensaver depends on:
ii  dbus-x11                   1.10.12-1
ii  gnome-icon-theme           3.12.0-2
ii  gnome-session-bin          3.22.1-1
ii  gsettings-desktop-schemas  3.22.0-1
ii  libc6                      2.24-5
ii  libcairo2                  1.14.6-1+b1
ii  libdbus-1-3                1.10.12-1
ii  libdbus-glib-1-2           0.108-1
ii  libgdk-pixbuf2.0-0         2.36.0-1
ii  libglib2.0-0               2.50.1-1
ii  libgnome-desktop-3-12      3.22.1-1
ii  libgnomekbd8               3.22.0.1-1
ii  libgtk-3-0                 3.22.2-1
ii  libpam0g                   1.1.8-3.3
ii  libsystemd0                231-10
ii  libx11-6                   2:1.6.3-1
ii  libxext6                   2:1.3.3-1
ii  libxklavier16              5.4-2
ii  libxxf86vm1                1:1.1.4-1

Versions of packages gnome-screensaver recommends:
ii  gnome-power-manager   3.22.1-1
ii  libpam-gnome-keyring  3.20.0-3

gnome-screensaver suggests no packages.

-- no debconf information