[Pkg-xfce-devel] Bug#788668: light-locker: Black screen(not powered on) after unlocking screen locked by closing the laptop lid

[valdaer]

Package: light-locker
Version: 1.6.0-2
Severity: important

Dear Maintainer,

When screen is locked triggered by closing the laptop lid then when user enters
password in light-locker screen goes black(powered/switched off). When screen
is locked not triggered by the closing lid event(for example xflock command
triggered by keyboard shortcut) screen unlocking is working fine tough.

I was thinking that this is a xfpm/systemd bug similar to this one:
https://bugzilla.xfce.org/show_bug.cgi?id=10535 but then I installed
Xscreensaver for a test and it was working fine so I presume this is most
probably light-locker bug.

On the other hand I was using light-locker before(1.4.0-1 version) and it was
working fine but it was at the time when testing was freezed and I had previous
versions of xfpm and systemd(don't remember exacly which versions). When I've
reverted the light-locker package to 1.4.0-2+b1 version but it didn't help.

I've also tried to verify that this issue exist without using xfpm too but
couldn't trigger lock screen by laptop lid through systemd/logind because of
this bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741491

The workaround that I am using for this issue is "xrandr --auto" command saved
to some keyboard shortcut taken from this bugtopic:
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1259339
however it is very annoying to do this every time when opening laptop lid and
it does mess external monitor sometimes.

I didn't notice anything extraordinary in journalctl logs, when I will find
time I will try to enable some debug options in light-locker/light-
dm/systemd/xfpm if these are easy to set.



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

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 light-locker depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.24.0-2
ii  libc6                                        2.19-18
ii  libcairo2                                    1.14.2-2
ii  libdbus-1-3                                  1.8.18-1
ii  libdbus-glib-1-2                             0.102-1
ii  libglib2.0-0                                 2.44.1-1
ii  libgtk-3-0                                   3.14.5-1
ii  libpango-1.0-0                               1.36.8-3
ii  libpangocairo-1.0-0                          1.36.8-3
ii  libsystemd0                                  215-18
ii  libx11-6                                     2:1.6.3-1
ii  libxext6                                     2:1.3.3-1
ii  libxss1                                      1:1.2.2-1
ii  lightdm                                      1.14.0-1

light-locker recommends no packages.

light-locker suggests no packages.