Michael Biebl wrote: > Package: kdebase-workspace-bin > Version: 4:4.2.2-2 > Severity: normal > File: /usr/lib/kde4/kded_powerdevil.so > > Hi, > > when I try to configure the power management settings within > systemsettings, I get the following error message: > > The configuration module can not be started, since there seems to be a > problem with PowerDevil Daemon. Read below for more details > Another power manager has been detected... > > No other power manager is running though (kpowersave/powersaved are not > installed fwiw, gnome-power-manager is not running > > The process claiming org.freedesktop.PowerManagement on the session bus > resp. org.freedesktop.Policy.Power is in both cases "kded4". >
More info, after looking a bit at the code:
powerdevil itself registers the org.freedesktop.Policy.Power dbus interface
in daemon/PowerDevilDaemon.cpp:161
and then has a check in
powerdevil/kcmodule/PowerDevilKCM.cpp:85
if (conn.interface()->isServiceRegistered("org.freedesktop.PowerManagement") ||
conn.interface()->isServiceRegistered("org.freedesktop.Policy.Power")) {
...
which subsequently fails.
Registering the org.freedesktop.Policy.Power interface only works, if a relevant
dbus config file is installed. PowerDevil does not install such a dbus config
file, bug powersaved does (/etc/dbus-1/system.d/powersave.conf).
So, indeed, after purging powersave, the kcm module successfully starts.
This of course is not the idea behind org.freedesktop.Policy.Power:
This interface was introduced to allow co-existence of powersaved (a system wide
power management daemon) with a user session power management daemon (like
gnome-power-manager, kpowersave or powerdevil).
powersaved will execute any actions if the org.freedesktop.Policy.Power
interface is grabbed by a process other then powersaved, i.e. a user is logged
into a graphical session.
My suggestion is to fix powerdevil/kcmodule/PowerDevilKCM.cpp:85 and not only
check if conn.interface()->isServiceRegistered("org.freedesktop.Policy.Power"),
but also, if the registered process does not belong to the user session.
Cheers,
Michael
--
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?
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