desktop-packages team mailing list archive

[Launchpad Bug Tracker <1252507@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gnome-settings-daemon (Ubuntu)
       Status: New => Confirmed

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-settings-daemon in Ubuntu.
https://bugs.launchpad.net/bugs/1252507

Title:
  gsd-backlight-helper fails to change backlight

Status in gnome-settings-daemon package in Ubuntu:
  Confirmed

Bug description:
  In Saucy Salamander (Ubuntu 13.10), nothing happens when programmatically changing the backlight using the command:
  pkexec /usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 50

  After issuing the above-mentioned command:

  1. There is no difference in the screen brightness.
  2. The slider in the "System Settings" -> "Brightness & Lock" remains unchanged.

  However, the value specified with --set-brightness argument is correctly reflected in the file:
  /sys/class/backlight/acpi_video0/actual_brightness
  and
  /sys/class/backlight/acpi_video0/actual_brightness

  
  Additionally, I'm using the proprietary Video driver for the AMD graphics accelerators from fglrx-updates. (I can't use the X.org X Server open source driver, because I get a lot of visual artefacts / screen refresh problems when I use it).

  Furthermore, adjusting the brightness directly from the GUI, using the
  slider in "System Settings" -> "Brightness & Lock" works correctly,
  changing the screen brightness, as is expected. This change in screen
  brightness can be confirmed by issuing the following commands:

  pkexec /usr/lib/gnome-settings-daemon/gsd-backlight-helper --get-brightness
  and
  cat /sys/class/backlight/acpi_video0/actual_brightness
  and
  cat /sys/class/backlight/acpi_video0/actual_brightness

  
  Ubuntu Release:
  --------------------------
  Description:	Ubuntu 13.10
  Release:	13.10

  Package version:
  -----------------------------
  gnome-settings-daemon:
    Installed: 3.8.5-0ubuntu11.1
    Candidate: 3.8.5-0ubuntu11.1
    Version table:
   *** 3.8.5-0ubuntu11.1 0
          500 http://us.archive.ubuntu.com/ubuntu/ saucy-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       3.8.5-0ubuntu9 0
          500 http://us.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages

  Expected Behavior:
  -------------------------------
  After issuing the command pkexec /usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness XX, the following should happen:

  1. The screen brightness should increase or decrease as per the XX value specified.
  2. The slider in the "System Settings" -> "Brightness & Lock" should change to reflect the new value.

  What Happens Instead:
  -----------------------------------
  1. There is no difference in the screen brightness.
  2. The slider in the "System Settings" -> "Brightness & Lock" remains unchanged.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1252507/+subscriptions