After installing the new (kf5) package group from [extra], I went back to my usual openbox desktop. When trying to launch dolphin (kde 4.13 version from [extra]) I got this :
% dolphin Object::connect: No such signal org::freedesktop::UPower::DeviceAdded(QString) Object::connect: No such signal org::freedesktop::UPower::DeviceRemoved(QString)
No dolphin windows appears and the program does not exit until CTRL-C.
Since kf5 relies on recent dependencies and the problem was looking related to upower, I did update upower to
and dolphin is now running fine.
The two previous "No such signal" lines are still there, though.