[Pkg-xfce-devel] Bug#834388: lightdm: Interferes with xscreensaver and emacs in fullscreen

[Nathan Paul Simons]

Package: lightdm
Version: 1.18.2-2
Severity: important

Dear Maintainer,

   * What led up to the situation?
     - Left computer unattended, came back to lightdm login screen.
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
     - Entered username and password expecting a fresh boot.
   * What was the outcome of this action?
     - xscreensaver was operating in the background.
   * What outcome did you expect instead?
     - That lightdm should not activate except in the case of switching
       users or on startup.

This is especially frustrating because when I do unlock the screen
(twice, once for lightdm and once for xscreensaver), my emacs in
fullscreen mode (F11) cannot get focus, and I can't switch to any other
window with alt-tab. The mouse still works as does the magic SysRq keys
(hence how I reboot), but I can't do anything other than magic SysRq
sync, mount readonly and reboot. I've never seen this from xscreensaver
before, and it only happened after a dist-upgrade.

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

Kernel: Linux 4.5.0-2-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
Init: systemd (via /run/systemd/system)

Versions of packages lightdm depends on:
ii  adduser                                3.115
ii  dbus                                   1.10.8-1
ii  debconf [debconf-2.0]                  1.5.59
ii  libaudit1                              1:2.6.5-1
ii  libc6                                  2.23-4
ii  libgcrypt20                            1.7.2-2
ii  libglib2.0-0                           2.48.1-2
ii  libpam-systemd                         230-7
ii  libpam0g                               1.1.8-3.3
ii  libxcb1                                1.11.1-1
ii  libxdmcp6                              1:1.1.2-1.1
ii  lightdm-gtk-greeter [lightdm-greeter]  2.0.1-2

Versions of packages lightdm recommends:
ii  xserver-xorg  1:7.7+16

Versions of packages lightdm suggests:
pn  accountsservice  <none>
ii  upower           0.99.4-3

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