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edit: Marked as solved because this problem hasn't occurred for a while. Will be re-opened if it occurs again. I removed some of those devices mentioned in the popup and that might have solved the problem.
When doing something that triggers a KDE desktop sound effect, such as emptying the trash or searching for something in Kate, this popup appears:

This happens only once per boot. After closing the window it doesn't reappear until the system is rebooted. All sounds work well, without any problems. ALSA is used, no Pulseaudio or other sound servers.
Any ideas what to do? Should I click "yes" when it wants to "forget" sound devices? There are multiple reports about this problem at the KDE bug tracker but I'm not sure if this is a bug or just a configuration error.
Last edited by ormu (2015-10-09 19:01:51)
There were some duplicate devices listed in the Phonon settings panel so I let it forget those. Now it only complains about one device.

This doesn't have duplicates and it won't go away even if I let it forget it. It appears again after reboot.
Last edited by ormu (2014-12-08 11:50:44)