Bug#806916: gnome-screensaver: Screensaver unlocks screen on wrong screen

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Bug#806916: gnome-screensaver: Screensaver unlocks screen on wrong screen

Joey Schulze
Package: gnome-screensaver
Version: 3.6.1-4
Severity: normal

Dear Maintainer,

I have discovered strange behaviour on GNOME under jessie.  The cause
may not be gnome-screensaver but in another package.  Please reassign
appropriately.

The situation:

Lenovo T530 with "VGA compatible controller: Intel Corporation 3rd Gen
Core processor Graphics Controller" graphics device, plus external
video projector from Acer connected via VGA.

Monitor configuration has the internal LCD panel as Screen 1, the
external device as Screen 2, and output is set to mirroring so that
the projectors displays the same as the notebook screen.  See attached
screenshot.

Once the external video projector is turned off and the screen lock
goes on or the notebook top is shut down (no hibernation) the main
screen remains blank when touching the mouse or keyboard.

If the screen is locked the unlock screen is displayed on Screen 2
which refers to the external projector turned off.  Personally I would
prefer to use the Notebook LCD panel so that you don't have to type
your password blindly.

Additionally, after typing the password and thus unlocking the screen,
or after re-opening the top (without the screen locker being active
strangely), the notebook display remains black.  Only the external
projector is used.

The only way to get out of this seems to be to remove the VGA cable so
that GNOME reorganizes it self and finally displays the desktop on the
notebook display.  Re-attaching the external projector re-enables
mirror mode and everything is fine.

Second oddity, when organizing your windows on several virtual
desktops, this arrangement gets lost during screen
unlocking/re-enabling.  All windows are arranged on the only first
virtual desktop.

I will not be able to reproduce this frequently since this happens in
a professional classroom I don't have permanent access to.

I hope the information above are helpful.  Please forward the
information upstream on demand.

Regards

        Joey

-- System Information:
Debian Release: 8.1
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.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                   1.8.18-0+deb8u1
ii  gnome-icon-theme           3.12.0-1
ii  gnome-session-bin          3.14.0-2
ii  gsettings-desktop-schemas  3.14.1-1
ii  libc6                      2.19-18
ii  libcairo2                  1.14.0-2.1
ii  libdbus-1-3                1.8.18-0+deb8u1
ii  libdbus-glib-1-2           0.102-1
ii  libgdk-pixbuf2.0-0         2.31.1-2+b1
ii  libglib2.0-0               2.42.1-1
ii  libgnome-desktop-3-10      3.14.1-1
ii  libgnomekbd8               3.6.0-1
ii  libgtk-3-0                 3.14.5-1
ii  libpam0g                   1.1.8-3.1
ii  libsystemd0                215-17+deb8u1
ii  libx11-6                   2:1.6.2-3
ii  libxext6                   2:1.3.3-1
ii  libxklavier16              5.2.1-1
ii  libxxf86vm1                1:1.1.3-1+b1

Versions of packages gnome-screensaver recommends:
pn  gnome-power-manager   <none>
ii  libpam-gnome-keyring  3.14.0-1+b1

gnome-screensaver suggests no packages.

-- no debconf information

--
GNU GPL: "The source will be with you... always."

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