Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-settings-daemon (Ubuntu)
Status: New => Confirmed
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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
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