Bug#766806: mate-power-manager: LCD brightness changes on login while running on battery power

[Ayke van Laethem]

Package: mate-power-manager
Version: 1.8.1+dfsg1-1
Severity: normal

Dear Maintainer,

On login, the LCD brightness is changed to the value in the Power Management
Preferences, under the "On AC Power" tab. This happens not only on AC power (as
expected), but also when running a laptop on battery power, which I would not
expect (I would expect the value listed there only to be applied on AC power,
not on battery power).

Oddly, when changing the brightness slider in the settings ("Set display
brightness to"), the new brightness is applied immediately when on AC power,
but is not (immediately) applied when running on battery power.

As a separate issue, but I'm mentioning it here anyway as it's related, there
is no way to *not* change brightness when running on AC power on login (and,
due to this bug, also on battery power). I personally prefer to set the
brightness depending on the environment, not (normally) based on battery power.
I can report a different bug for this if necessary, but maybe that feature is
too close to the freeze to be added anyway.

Here are my power management preferences:

~$ dconf dump /org/mate/power-manager/
[/]
button-power='interactive'
sleep-display-battery=600
brightness-ac=22.0
info-last-device='/org/freedesktop/UPower/devices/mouse_0003o046DoC52Bx0004'
backlight-battery-reduce=false
button-lid-ac='nothing'
spindown-enable-battery=true
info-stats-graph-points=true
info-stats-graph-smooth=false
action-critical-battery='suspend'
button-suspend='suspend'
info-history-graph-points=true
info-history-time=86400
info-page-number=0
idle-dim-ac=false
info-history-type='charge'
idle-dim-battery=false
button-lid-battery='suspend'
info-stats-type='charge-data'
info-history-graph-smooth=false
icon-policy='never'

By changing the "Set display brightness to" setting a few times and logging out
and back in, I have confirmed it is really set to that setting. And it is that
setting it is set to when it is on battery power as well.

I have attached a screenshot of the Power Management Preferences window.



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

Kernel: Linux 3.16-2-amd64 (SMP w/2 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 mate-power-manager depends on:
ii  consolekit                                      0.4.6-5
ii  dbus-x11                                        1.8.8-2
ii  libatk1.0-0                                     2.14.0-1
ii  libc6                                           2.19-11
ii  libcairo2                                       1.12.16-5
ii  libcanberra-gtk0                                0.30-2.1
ii  libcanberra0                                    0.30-2.1
ii  libdbus-1-3                                     1.8.8-2
ii  libdbus-glib-1-2                                0.102-1
ii  libfontconfig1                                  2.11.0-6.1
ii  libfreetype6                                    2.5.2-2
ii  libgdk-pixbuf2.0-0                              2.31.1-2+b1
ii  libglib2.0-0                                    2.42.0-2
ii  libgnome-keyring0                               3.12.0-1+b1
ii  libgtk2.0-0                                     2.24.25-1
ii  libmate-panel-applet-4-1                        1.8.1+dfsg1-1
ii  libnotify4                                      0.7.6-2
ii  libpango-1.0-0                                  1.36.8-2
ii  libpangocairo-1.0-0                             1.36.8-2
ii  libpangoft2-1.0-0                               1.36.8-2
ii  libunique-1.0-0                                 1.1.6-5
ii  libupower-glib3                                 0.99.1-3
ii  libx11-6                                        2:1.6.2-3
ii  libxext6                                        2:1.3.3-1
ii  libxrandr2                                      2:1.4.2-1
ii  libxrender1                                     1:0.9.8-1
ii  mate-notification-daemon [notification-daemon]  1.8.0-2
ii  mate-power-manager-common                       1.8.1+dfsg1-1
ii  notification-daemon                             0.7.6-2
ii  policykit-1                                     0.105-7
ii  systemd                                         215-5+b1
ii  upower                                          0.99.1-3
ii  xfce4-notifyd [notification-daemon]             0.2.4-3

Versions of packages mate-power-manager recommends:
ii  udisks  1.0.5-1+b1

Versions of packages mate-power-manager suggests:
ii  mate-polkit  1.8.0+dfsg1-4
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