Public bug reported:

Binary package hint: phonon

I'm not sure at all what is going on and if Phonon is really the
culprit. For more background, please read this
http://alexandervanloon.nl/english/?p=331 blog post and this
forum.kde.org/viewtopic.php?f=66&t=84887 forum topic.

I've been investigating the power consumption of Ubuntu 9.10 and Kubuntu
9.10 on my notebook. My notebook is an Acer Travelmate TimeLine 8371. I
noticed that Kubuntu consumes a lot more power than Ubuntu (for
measurements with powertop see my blog post) because on Kubuntu my audio
devices (hwCOD2 Intel G45 DEVCTG and hwCOD0 Realtek ALC269) are active
100.0% (or less) of the time. Powertop accompanies that warning with a
suggestion to 'Turn HD audio powersave on' but pressing the button to
implement the suggestion does nothing, powertop keeps coming back with
the warning.

I experience this problem in Kubuntu 9.10, the latest Kubuntu 10.04 and
10.04 with the 2.6.33-rc8 kernel. Because powertop doesn't warn me about
the audio device when I use Ubuntu and because power consumption is
lower on Ubuntu, I'm led to believe that this bug is specific to KDE.

I believe there is some connection to the fact that KDE often warns me
after starting up that it believes that an internal audio device was
removed. See the forum topic for more detailed info on that. KDE asks if
it should forget about the device, no matter what the answer is the
warning and question keep coming back as soon as I turn off the PC and
start KDE again.

I realize this report might not be helpful enough, but I'm willing to
provide whatever information it takes to get it fixed. KDE is draining
my battery like there is no tomorrow, while battery life is very
important to me.

ProblemType: Bug
Architecture: amd64
Date: Sat Feb 13 17:54:02 2010
DistroRelease: Ubuntu 10.04
InstallationMedia: Kubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100209)
Package: phonon 4:4.6.1-1ubuntu2
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: qt4-x11
Uname: Linux 2.6.33-020633rc8-generic x86_64

** Affects: phonon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

-- 
"an audio device is active 100.0% procent of the time" according to powertop
https://bugs.launchpad.net/bugs/521424
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