Bug#759280: gnome-control-center: Screen brightness set to 0 after display turned off in Gnome Control Center - Displays

[Gabriele Del Prete]

Package: gnome-control-center
Version: 1:3.12.1-4
Severity: important

Dear Maintainer,

in a multimonitor setup, if I turn my laptop buitin screen off using the Displays panel of Gnome Control Center,
the screen brightness control under Power Savings gets set to 0.
After I turn the builtin screen back on, brightness under Power Savings isn't reset to the value it had before but
remains stuck to 0.

Steps to reproduce:
0) Have a multimonitor setup, with a laptop and an external monitor.
1) Start with 2 monitors on.
2) Turn laptop screen off in Displays (Gnome Controlm Center). Laptop monitor will shut down.
3) (optinally) notice brightness is set to 0 under Power Savings
4) Turn laptop screen back on in Displays.
5) Laptop screen will be black; you now need to readjust brightness (it's working with Fn keys and thru Power Savings for me).

Expected outcome:
Lapton screen has brightness set to a value greater than 0.

Thank you,
regards.

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

Kernel: Linux 3.14-2-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

Versions of packages gnome-control-center depends on:
ii  accountsservice            0.6.37-3
ii  apg                        2.2.3.dfsg.1-2
ii  colord                     1.2.1-1
ii  desktop-file-utils         0.22-1
ii  gnome-control-center-data  1:3.12.1-4
ii  gnome-desktop3-data        3.12.2-2
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  gnome-menus                3.13.3-1
ii  gnome-settings-daemon      3.12.2-1
ii  gsettings-desktop-schemas  3.12.2-1
ii  libaccountsservice0        0.6.37-3
ii  libatk1.0-0                2.12.0-1
ii  libc6                      2.19-7
ii  libcairo2                  1.12.16-2
ii  libcanberra-gtk3-0         0.30-2
ii  libcanberra0               0.30-2
ii  libcheese-gtk23            3.12.2-1
ii  libcheese7                 3.12.2-1
ii  libclutter-1.0-0           1.18.2-2
ii  libclutter-gtk-1.0-0       1.5.2-2
ii  libcolord-gtk1             0.1.25-1.1+b1
ii  libcolord2                 1.2.1-1
ii  libcups2                   1.7.4-4
ii  libdbus-glib-1-2           0.102-1
ii  libfontconfig1             2.11.0-6
ii  libgdk-pixbuf2.0-0         2.30.7-1
ii  libgl1-mesa-glx [libgl1]   10.2.5-1
ii  libglib2.0-0               2.40.0-4
ii  libgnome-bluetooth13       3.12.0-5
ii  libgnome-desktop-3-10      3.12.2-2
ii  libgoa-1.0-0b              3.12.4-1
ii  libgoa-backend-1.0-1       3.12.4-1
ii  libgrilo-0.2-1             0.2.10-1
ii  libgtk-3-0                 3.12.2-2
ii  libgtop2-7                 2.28.5-2
ii  libibus-1.0-5              1.5.8-2
ii  libkrb5-3                  1.12.1+dfsg-7
ii  libmm-glib0                1.2.0-1
ii  libnm-glib-vpn1            0.9.10.0-1
ii  libnm-glib4                0.9.10.0-1
ii  libnm-gtk0                 0.9.10.0-2
ii  libnm-util2                0.9.10.0-1
ii  libpango-1.0-0             1.36.3-1
ii  libpangocairo-1.0-0        1.36.3-1
ii  libpolkit-gobject-1-0      0.105-6.1
ii  libpulse-mainloop-glib0    5.0-6
ii  libpulse0                  5.0-6
ii  libpwquality1              1.2.3-1
ii  libsmbclient               2:4.1.11+dfsg-1
ii  libsoup2.4-1               2.46.0-2
ii  libupower-glib2            0.99.0-3
ii  libwacom2                  0.8-1
ii  libx11-6                   2:1.6.2-2
ii  libxi6                     2:1.7.4-1
ii  libxml2                    2.9.1+dfsg1-4

Versions of packages gnome-control-center recommends:
ii  cups-pk-helper         0.2.5-2
ii  gkbd-capplet           3.6.0-1
ii  gnome-online-accounts  3.12.4-1
ii  gnome-user-guide       3.12.2-1
ii  gnome-user-share       3.10.2-1
ii  iso-codes              3.55-1
pn  libnss-myhostname      <none>
ii  mesa-utils             8.2.0-1
ii  mousetweaks            3.12.0-1
ii  network-manager-gnome  0.9.10.0-2
ii  ntp                    1:4.2.6.p5+dfsg-3
ii  policykit-1-gnome      0.105-2
ii  realmd                 0.15.1-1
ii  rygel                  0.22.2-2
ii  rygel-tracker          0.22.2-2
ii  system-config-printer  1.4.3-4

Versions of packages gnome-control-center suggests:
ii  gstreamer1.0-pulseaudio  1.4.0-1
ii  libcanberra-gtk-module   0.30-2
ii  libcanberra-gtk3-module  0.30-2
ii  x11-xserver-utils        7.7+3

-- no debconf information