Display brightness turn down on battery mode after 10 seconds (power manager settings ignored)

Bug #908637 reported by Lars Volker on 2011-12-26
This bug affects 2 people
Affects Status Importance Assigned to Milestone
gnome-power-manager (Debian)
gnome-power-manager (Ubuntu)
xfce4-power-manager (Ubuntu)

Bug Description

On my Thinkpad T400 in battery mode, the display brightness turns considerably lower after not moving the mouse or typing anything for about 10 seconds. The problem is also described here (http://askubuntu.com/questions/65969/display-brightness-goes-two-shades-darker-if-i-am-idle-for-10-11-seconds) but in XFCE the dialog described in the solution doesn't exist.

I already tried changing the duration and the brightness in the xfce4-power-manager-settings dialog, but all changes there are effectively ignored. I also tried killing the power manager, killing upowerd, killing xscreensaver, but the behaviour persists.

I don't know where to look for the setting causing this behaviour, but nonetheless xfce4-power-manager-settings should detect, that its settings won't take effect and should warn about this.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xfce4-power-manager 1.0.10-4ubuntu0.1
ProcVersionSignature: Ubuntu 3.0.0-15.24-generic 3.0.13
Uname: Linux 3.0.0-15-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Mon Dec 26 01:03:12 2011
InstallationMedia: Xubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100415)
 PATH=(custom, user)
SourcePackage: xfce4-power-manager
UpgradeStatus: Upgraded to oneiric on 2011-10-24 (62 days ago)

Lars Volker (lv) wrote :
Lars Volker (lv) wrote :

I just found, that gnome-settings-daemon was running on my system and that killing it got me rid of that issue. However I still think xfce4-power-manager-settings should have told me that there was an issue with the configuration. Also, when starting gnome-settings-daemon on the command line and waiting 10 seconds, the following pops up as soon as the display backlight gets dimmed:

(gnome-settings-daemon:16612): power-plugin-WARNING **: IsInhibited failed: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

I also found the backlight dimming options in gconf-editor in /apps/gnome-power-manager/backlight and deactivated all entries, which didn't help.

Lars Volker (lv) wrote :

I also just figured out here (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650086) that you can manually adjust the time after which the backlight gets dimmed with the following command:

gsettings set org.gnome.settings-daemon.plugins.power idle-dim-time <seconds>

Nokir (nokir) wrote :

xfce4-power-manager seems to work normally after i did

gsettings set org.gnome.settings-daemon.plugins.power idle-dim-time 0

Launchpad Janitor (janitor) wrote :

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

Changed in xfce4-power-manager (Ubuntu):
status: New → Confirmed
Maarten Bezemer (veger) wrote :

Thanks for taking the time to find this bug in the upstream bug tracking system this is a tremendous help. Launchpad has the ability to watch lots of upstream bug trackers and this can be done by following the procedure documented at https://wiki.ubuntu.com/Bugs/Watches. I've added the bug watch for this bug report.

Changed in xfce4-power-manager:
status: Unknown → New
Launchpad Janitor (janitor) wrote :

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

Changed in gnome-power-manager (Ubuntu):
status: New → Confirmed
affects: xfce4-power-manager → gnome-power-manager (Ubuntu)
Changed in gnome-power-manager (Ubuntu):
importance: Unknown → Undecided
Changed in xfce4-power-manager (Ubuntu):
status: Confirmed → Invalid
Changed in gnome-power-manager (Debian):
status: Unknown → New
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